Vulnerability-Lookup

ubuntu-cve-2026-42536

Vulnerability from osv_ubuntu

Published

2026-06-08 16:16

Modified

2026-07-21 10:39

Summary

Details

Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67. Users are recommended to upgrade to version 2.4.68, which fixes the issue.

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-42536	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-42536	REPORT
	https://httpd.apache.org/security/vulnerabilities…	REPORT
	https://httpd.apache.org/security/vulnerabilities…	REPORT
	http://www.openwall.com/lists/oss-security/2026/06/08/9	REPORT
	https://ubuntu.com/security/notices/USN-8516-1	ADVISORY
	https://ubuntu.com/security/notices/USN-8571-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
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            "binary_version": "2.4.7-1ubuntu4.22+esm14"
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          {
            "binary_name": "apache2-bin",
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          },
          {
            "binary_name": "apache2-data",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-mpm-event",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-mpm-itk",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-mpm-prefork",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-mpm-worker",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-suexec",
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          },
          {
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          },
          {
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          },
          {
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          },
          {
            "binary_name": "apache2.2-bin",
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          },
          {
            "binary_name": "libapache2-mod-macro",
            "binary_version": "1:2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "libapache2-mod-proxy-html",
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      "package": {
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        "purl": "pkg:deb/ubuntu/apache2@2.4.7-1ubuntu4.22+esm14?arch=source\u0026distro=esm-infra-legacy/trusty"
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        {
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            {
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      ],
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        "2.4.6-2ubuntu3",
        "2.4.6-2ubuntu4",
        "2.4.7-1ubuntu1",
        "2.4.7-1ubuntu2",
        "2.4.7-1ubuntu3",
        "2.4.7-1ubuntu4",
        "2.4.7-1ubuntu4.1",
        "2.4.7-1ubuntu4.4",
        "2.4.7-1ubuntu4.5",
        "2.4.7-1ubuntu4.6",
        "2.4.7-1ubuntu4.7",
        "2.4.7-1ubuntu4.8",
        "2.4.7-1ubuntu4.9",
        "2.4.7-1ubuntu4.10",
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        "2.4.7-1ubuntu4.13",
        "2.4.7-1ubuntu4.15",
        "2.4.7-1ubuntu4.16",
        "2.4.7-1ubuntu4.17",
        "2.4.7-1ubuntu4.18",
        "2.4.7-1ubuntu4.19",
        "2.4.7-1ubuntu4.20",
        "2.4.7-1ubuntu4.21",
        "2.4.7-1ubuntu4.22",
        "2.4.7-1ubuntu4.22+esm1",
        "2.4.7-1ubuntu4.22+esm2",
        "2.4.7-1ubuntu4.22+esm3",
        "2.4.7-1ubuntu4.22+esm4",
        "2.4.7-1ubuntu4.22+esm5",
        "2.4.7-1ubuntu4.22+esm6",
        "2.4.7-1ubuntu4.22+esm8",
        "2.4.7-1ubuntu4.22+esm9",
        "2.4.7-1ubuntu4.22+esm10",
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        "2.4.7-1ubuntu4.22+esm13"
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    {
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          {
            "binary_name": "apache2-utils",
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        "ecosystem": "Ubuntu:Pro:16.04:LTS",
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        "purl": "pkg:deb/ubuntu/apache2@2.4.18-2ubuntu3.17+esm19?arch=source\u0026distro=esm-infra-legacy/xenial"
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          "events": [
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          "type": "ECOSYSTEM"
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        "2.4.18-2ubuntu1",
        "2.4.18-2ubuntu2",
        "2.4.18-2ubuntu3",
        "2.4.18-2ubuntu3.1",
        "2.4.18-2ubuntu3.2",
        "2.4.18-2ubuntu3.3",
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        "2.4.18-2ubuntu3.7",
        "2.4.18-2ubuntu3.8",
        "2.4.18-2ubuntu3.9",
        "2.4.18-2ubuntu3.10",
        "2.4.18-2ubuntu3.12",
        "2.4.18-2ubuntu3.13",
        "2.4.18-2ubuntu3.14",
        "2.4.18-2ubuntu3.15",
        "2.4.18-2ubuntu3.17",
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        "2.4.18-2ubuntu3.17+esm2",
        "2.4.18-2ubuntu3.17+esm3",
        "2.4.18-2ubuntu3.17+esm4",
        "2.4.18-2ubuntu3.17+esm5",
        "2.4.18-2ubuntu3.17+esm6",
        "2.4.18-2ubuntu3.17+esm7",
        "2.4.18-2ubuntu3.17+esm8",
        "2.4.18-2ubuntu3.17+esm9",
        "2.4.18-2ubuntu3.17+esm10",
        "2.4.18-2ubuntu3.17+esm11",
        "2.4.18-2ubuntu3.17+esm12",
        "2.4.18-2ubuntu3.17+esm13",
        "2.4.18-2ubuntu3.17+esm14",
        "2.4.18-2ubuntu3.17+esm16",
        "2.4.18-2ubuntu3.17+esm17",
        "2.4.18-2ubuntu3.17+esm18"
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    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "apache2",
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          {
            "binary_name": "apache2-bin",
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          },
          {
            "binary_name": "apache2-data",
            "binary_version": "2.4.29-1ubuntu4.27+esm10"
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          {
            "binary_name": "apache2-suexec-custom",
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          {
            "binary_name": "apache2-suexec-pristine",
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          {
            "binary_name": "apache2-utils",
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "apache2",
        "purl": "pkg:deb/ubuntu/apache2@2.4.29-1ubuntu4.27+esm10?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
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          "type": "ECOSYSTEM"
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      "versions": [
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        "2.4.29-1ubuntu2",
        "2.4.29-1ubuntu3",
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        "2.4.29-1ubuntu4.2",
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        "2.4.29-1ubuntu4.5",
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        "2.4.29-1ubuntu4.19",
        "2.4.29-1ubuntu4.20",
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        "2.4.29-1ubuntu4.22",
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        "2.4.29-1ubuntu4.27+esm2",
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        "2.4.29-1ubuntu4.27+esm7",
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        "2.4.29-1ubuntu4.27+esm9"
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    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
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            "binary_name": "apache2",
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          {
            "binary_name": "apache2-bin",
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            "binary_name": "apache2-data",
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          {
            "binary_name": "apache2-suexec-custom",
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            "binary_name": "apache2-suexec-pristine",
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          {
            "binary_name": "apache2-utils",
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            "binary_name": "libapache2-mod-md",
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            "binary_name": "libapache2-mod-proxy-uwsgi",
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        "availability": "No subscription required",
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          {
            "binary_name": "apache2-bin",
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            "binary_name": "apache2-data",
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            "binary_name": "apache2-suexec-pristine",
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            "binary_name": "apache2-utils",
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            "binary_name": "apache2-bin",
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            "binary_name": "apache2-data",
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            "binary_name": "apache2-suexec-custom",
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            "binary_name": "apache2-suexec-pristine",
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CVE-2026-42536 (GCVE-0-2026-42536)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:23 – Updated: 2026-07-22 12:08

Title

Apache HTTP Server: mod_xml2enc heap overflow

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-122 - Heap-based Buffer Overflow
CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

apache

References

9 references

URL	Tags
https://httpd.apache.org/security/vulnerabilities…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/06/08/9
https://access.redhat.com/security/cve/CVE-2026-42536	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2486411	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:34109	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:42828	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:41906	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25042	vendor-advisoryx_refsource_REDHAT

Impacted products

7 products

Vendor	Product	Version
Apache Software Foundation	Apache HTTP Server	Affected: 2.4.0 , ≤ 2.4.67 (semver)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:2.4.63-13.el10_2.4 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 8100020260714175253.489197e6 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.4.62-13.el9_8.5 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Hardened Images	Unaffected: 2.4.68-1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7

Credits

Zhenpeng (Leo) Lin at depthfirst

Show details on NVD website

JSON

To clipboard

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usn-8516-1

Vulnerability from osv_ubuntu

Published

2026-07-08 13:49

Modified

2026-07-08 13:49

Summary

apache2 vulnerabilities

Details

It was discovered that Apache HTTP Server's mod_ldap module incorrectly handled memory when processing per-directory configurations. An attacker could use this issue to cause the server to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-29167)

It was discovered that Apache HTTP Server's mod_proxy_ftp module incorrectly handled HTML generation for FTP directory listings. A remote attacker could possibly use this issue to inject arbitrary web script or HTML. (CVE-2026-29170)

It was discovered that Apache HTTP Server's mod_proxy_html module incorrectly handled certain content from an untrusted backend. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-34355)

It was discovered that Apache HTTP Server incorrectly handled ProxyPassReverseCookie directives with a malicious backend server. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-34356)

It was discovered that Apache HTTP Server's mod_dav_fs module incorrectly handled certain path operations. An authenticated user could possibly use this issue to manipulate trusted WebDAV property databases or cause a denial of service. (CVE-2026-42535)

It was discovered that Apache HTTP Server's mod_xml2enc module incorrectly handled certain content from an untrusted backend. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-42536)

It was discovered that Apache HTTP Server incorrectly handled response headers when multiple content languages were configured. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-43951)

It was discovered that Apache HTTP Server incorrectly restricted certain file functions in expressions within .htaccess files. A local attacker with .htaccess write access could possibly use this issue to obtain sensitive information. (CVE-2026-44119)

It was discovered that Apache HTTP Server's mod_ssl module incorrectly handled OCSP responses from an attacker-controlled server. A remote attacker could possibly use this issue to obtain sensitive information or cause a denial of service. (CVE-2026-44185)

It was discovered that Apache HTTP Server's mod_proxy_ftp module incorrectly handled responses from an attacker-controlled backend FTP server. A remote attacker could possibly use this issue to cause Apache HTTP Server to stop responding, resulting in a denial of service. (CVE-2026-44186)

It was discovered that Apache HTTP Server incorrectly handled crafted regular expressions in the server configuration. An attacker could possibly use this issue to execute arbitrary code or cause a denial of service. (CVE-2026-44631)

It was discovered that Apache HTTP Server's mod_http2 module had a use-after-free vulnerability when file handles were exhausted. A remote attacker could possibly use this issue to cause Apache HTTP Server to crash, resulting in a denial of service. (CVE-2026-48913)

References

URL

Type

	https://ubuntu.com/security/notices/USN-8516-1	ADVISORY
	https://ubuntu.com/security/CVE-2026-29167	REPORT
	https://ubuntu.com/security/CVE-2026-29170	REPORT
	https://ubuntu.com/security/CVE-2026-34355	REPORT
	https://ubuntu.com/security/CVE-2026-34356	REPORT
	https://ubuntu.com/security/CVE-2026-42535	REPORT
	https://ubuntu.com/security/CVE-2026-42536	REPORT
	https://ubuntu.com/security/CVE-2026-43951	REPORT
	https://ubuntu.com/security/CVE-2026-44119	REPORT
	https://ubuntu.com/security/CVE-2026-44185	REPORT
	https://ubuntu.com/security/CVE-2026-44186	REPORT
	https://ubuntu.com/security/CVE-2026-44631	REPORT
	https://ubuntu.com/security/CVE-2026-48913	REPORT

JSON

To clipboard

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                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42535",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42536",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43951",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44119",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44185",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44186",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44631",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-48913",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
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          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
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      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "apache2",
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        "2.4.52-1ubuntu4.20",
        "2.4.52-1ubuntu4.21"
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    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-29167",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-29170",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34355",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34356",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42535",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42536",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43951",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44119",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44185",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44186",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44631",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-48913",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
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      "ecosystem_specific": {
        "availability": "No subscription required",
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      },
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        {
          "events": [
            {
              "introduced": "0"
            },
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      ],
      "versions": [
        "2.4.57-2ubuntu2",
        "2.4.57-2ubuntu3",
        "2.4.58-1ubuntu1",
        "2.4.58-1ubuntu2",
        "2.4.58-1ubuntu6",
        "2.4.58-1ubuntu7",
        "2.4.58-1ubuntu8",
        "2.4.58-1ubuntu8.1",
        "2.4.58-1ubuntu8.2",
        "2.4.58-1ubuntu8.3",
        "2.4.58-1ubuntu8.4",
        "2.4.58-1ubuntu8.5",
        "2.4.58-1ubuntu8.6",
        "2.4.58-1ubuntu8.7",
        "2.4.58-1ubuntu8.8",
        "2.4.58-1ubuntu8.10",
        "2.4.58-1ubuntu8.11",
        "2.4.58-1ubuntu8.12",
        "2.4.58-1ubuntu8.13"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-29167",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-29170",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34355",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34356",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42535",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42536",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43951",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44119",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44185",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44186",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44631",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-48913",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "apache2",
            "binary_version": "2.4.66-2ubuntu2.4"
          },
          {
            "binary_name": "apache2-bin",
            "binary_version": "2.4.66-2ubuntu2.4"
          },
          {
            "binary_name": "apache2-data",
            "binary_version": "2.4.66-2ubuntu2.4"
          },
          {
            "binary_name": "apache2-suexec-custom",
            "binary_version": "2.4.66-2ubuntu2.4"
          },
          {
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          },
          {
            "binary_name": "apache2-utils",
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      "package": {
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        "name": "apache2",
        "purl": "pkg:deb/ubuntu/apache2@2.4.66-2ubuntu2.4?arch=source\u0026distro=resolute"
      },
      "ranges": [
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      "versions": [
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        "2.4.66-2ubuntu1",
        "2.4.66-2ubuntu2",
        "2.4.66-2ubuntu2.1",
        "2.4.66-2ubuntu2.2"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Apache HTTP Server\u0027s mod_ldap module incorrectly\nhandled memory when processing per-directory configurations. An attacker\ncould use this issue to cause the server to crash, resulting in a denial of\nservice, or possibly execute arbitrary code. (CVE-2026-29167)\n\nIt was discovered that Apache HTTP Server\u0027s mod_proxy_ftp module\nincorrectly handled HTML generation for FTP directory listings. A remote\nattacker could possibly use this issue to inject arbitrary web script or\nHTML. (CVE-2026-29170)\n\nIt was discovered that Apache HTTP Server\u0027s mod_proxy_html module\nincorrectly handled certain content from an untrusted backend. A remote\nattacker could possibly use this issue to cause Apache HTTP Server to\ncrash, resulting in a denial of service. (CVE-2026-34355)\n\nIt was discovered that Apache HTTP Server incorrectly handled\nProxyPassReverseCookie directives with a malicious backend server. A remote\nattacker could possibly use this issue to cause Apache HTTP Server to\ncrash, resulting in a denial of service. (CVE-2026-34356)\n\nIt was discovered that Apache HTTP Server\u0027s mod_dav_fs module incorrectly\nhandled certain path operations. An authenticated user could possibly use\nthis issue to manipulate trusted WebDAV property databases or cause a\ndenial of service. (CVE-2026-42535)\n\nIt was discovered that Apache HTTP Server\u0027s mod_xml2enc module incorrectly\nhandled certain content from an untrusted backend. A remote attacker could\npossibly use this issue to cause Apache HTTP Server to crash, resulting in\na denial of service. (CVE-2026-42536)\n\nIt was discovered that Apache HTTP Server incorrectly handled response\nheaders when multiple content languages were configured. A remote attacker\ncould possibly use this issue to obtain sensitive information.\n(CVE-2026-43951)\n\nIt was discovered that Apache HTTP Server incorrectly restricted certain\nfile functions in expressions within .htaccess files. A local attacker with\n.htaccess write access could possibly use this issue to obtain sensitive\ninformation. (CVE-2026-44119)\n\nIt was discovered that Apache HTTP Server\u0027s mod_ssl module incorrectly\nhandled OCSP responses from an attacker-controlled server. A remote\nattacker could possibly use this issue to obtain sensitive information or\ncause a denial of service. (CVE-2026-44185)\n\nIt was discovered that Apache HTTP Server\u0027s mod_proxy_ftp module\nincorrectly handled responses from an attacker-controlled backend FTP\nserver. A remote attacker could possibly use this issue to cause Apache\nHTTP Server to stop responding, resulting in a denial of service.\n(CVE-2026-44186)\n\nIt was discovered that Apache HTTP Server incorrectly handled crafted\nregular expressions in the server configuration. An attacker could possibly\nuse this issue to execute arbitrary code or cause a denial of service.\n(CVE-2026-44631)\n\nIt was discovered that Apache HTTP Server\u0027s mod_http2 module had a\nuse-after-free vulnerability when file handles were exhausted. A remote\nattacker could possibly use this issue to cause Apache HTTP Server to\ncrash, resulting in a denial of service. (CVE-2026-48913)",
  "id": "USN-8516-1",
  "modified": "2026-07-08T13:49:49Z",
  "published": "2026-07-08T13:49:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8516-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-29167"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-29170"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34355"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34356"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42535"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42536"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43951"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44119"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44185"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44186"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44631"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-48913"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "apache2 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-29167",
    "UBUNTU-CVE-2026-29170",
    "UBUNTU-CVE-2026-34355",
    "UBUNTU-CVE-2026-34356",
    "UBUNTU-CVE-2026-42535",
    "UBUNTU-CVE-2026-42536",
    "UBUNTU-CVE-2026-43951",
    "UBUNTU-CVE-2026-44119",
    "UBUNTU-CVE-2026-44185",
    "UBUNTU-CVE-2026-44186",
    "UBUNTU-CVE-2026-44631",
    "UBUNTU-CVE-2026-48913"
  ]
}

usn-8571-1

Vulnerability from osv_ubuntu

Published

2026-07-20 19:03

Modified

2026-07-20 19:03

Summary

apache2 vulnerabilities

Details

Pavel Kohout and Arkadi Vainbrand discovered that Apache HTTP Server incorrectly handled certain memory operations in mod_authn_socache. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-33007)

Haruki Oyama, Merih Mengisteab, and Dawit Jeong discovered that Apache HTTP Server had an HTTP response splitting vulnerability in multiple modules when used with untrusted or compromised backend servers. An attacker could possibly use this issue to inject arbitrary HTTP headers. (CVE-2026-33523)

Elhanan Haenel discovered that Apache HTTP Server incorrectly handled certain memory operations in mod_proxy_ajp. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-33857)

Tianshuo Han and Jérôme Djouder discovered that Apache HTTP Server incorrectly handled certain string operations in mod_proxy_ajp. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-34032)

It was discovered that Apache HTTP Server's mod_http2 module had a use-after-free vulnerability when file handles were exhausted. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-48913)

References

URL

Type

	https://ubuntu.com/security/notices/USN-8571-1	ADVISORY
	https://ubuntu.com/security/CVE-2026-33007	REPORT
	https://ubuntu.com/security/CVE-2026-33523	REPORT
	https://ubuntu.com/security/CVE-2026-33857	REPORT
	https://ubuntu.com/security/CVE-2026-34032	REPORT
	https://ubuntu.com/security/CVE-2026-34355	REPORT
	https://ubuntu.com/security/CVE-2026-34356	REPORT
	https://ubuntu.com/security/CVE-2026-42535	REPORT
	https://ubuntu.com/security/CVE-2026-42536	REPORT
	https://ubuntu.com/security/CVE-2026-43951	REPORT
	https://ubuntu.com/security/CVE-2026-44119	REPORT
	https://ubuntu.com/security/CVE-2026-44185	REPORT
	https://ubuntu.com/security/CVE-2026-44186	REPORT
	https://ubuntu.com/security/CVE-2026-44631	REPORT
	https://ubuntu.com/security/CVE-2026-48913	REPORT
	https://ubuntu.com/security/CVE-2026-49975	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-33007",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-33523",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-33857",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34032",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34355",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34356",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42535",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42536",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43951",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44119",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44185",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44186",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "apache2",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-bin",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-data",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-mpm-event",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-mpm-itk",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-mpm-prefork",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-mpm-worker",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-suexec",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-suexec-custom",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-suexec-pristine",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2-utils",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "apache2.2-bin",
            "binary_version": "2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "libapache2-mod-macro",
            "binary_version": "1:2.4.7-1ubuntu4.22+esm14"
          },
          {
            "binary_name": "libapache2-mod-proxy-html",
            "binary_version": "1:2.4.7-1ubuntu4.22+esm14"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "apache2",
        "purl": "pkg:deb/ubuntu/apache2@2.4.7-1ubuntu4.22+esm14?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.7-1ubuntu4.22+esm14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.6-2ubuntu2",
        "2.4.6-2ubuntu3",
        "2.4.6-2ubuntu4",
        "2.4.7-1ubuntu1",
        "2.4.7-1ubuntu2",
        "2.4.7-1ubuntu3",
        "2.4.7-1ubuntu4",
        "2.4.7-1ubuntu4.1",
        "2.4.7-1ubuntu4.4",
        "2.4.7-1ubuntu4.5",
        "2.4.7-1ubuntu4.6",
        "2.4.7-1ubuntu4.7",
        "2.4.7-1ubuntu4.8",
        "2.4.7-1ubuntu4.9",
        "2.4.7-1ubuntu4.10",
        "2.4.7-1ubuntu4.11",
        "2.4.7-1ubuntu4.13",
        "2.4.7-1ubuntu4.15",
        "2.4.7-1ubuntu4.16",
        "2.4.7-1ubuntu4.17",
        "2.4.7-1ubuntu4.18",
        "2.4.7-1ubuntu4.19",
        "2.4.7-1ubuntu4.20",
        "2.4.7-1ubuntu4.21",
        "2.4.7-1ubuntu4.22",
        "2.4.7-1ubuntu4.22+esm1",
        "2.4.7-1ubuntu4.22+esm2",
        "2.4.7-1ubuntu4.22+esm3",
        "2.4.7-1ubuntu4.22+esm4",
        "2.4.7-1ubuntu4.22+esm5",
        "2.4.7-1ubuntu4.22+esm6",
        "2.4.7-1ubuntu4.22+esm8",
        "2.4.7-1ubuntu4.22+esm9",
        "2.4.7-1ubuntu4.22+esm10",
        "2.4.7-1ubuntu4.22+esm12",
        "2.4.7-1ubuntu4.22+esm13"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-33007",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-33523",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-33857",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34032",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34355",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-34356",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42535",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-42536",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-43951",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44119",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44185",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44186",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-44631",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-49975",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "apache2",
            "binary_version": "2.4.18-2ubuntu3.17+esm19"
          },
          {
            "binary_name": "apache2-bin",
            "binary_version": "2.4.18-2ubuntu3.17+esm19"
          },
          {
            "binary_name": "apache2-data",
            "binary_version": "2.4.18-2ubuntu3.17+esm19"
          },
          {
            "binary_name": "apache2-suexec-custom",
            "binary_version": "2.4.18-2ubuntu3.17+esm19"
          },
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  ],
  "aliases": [],
  "details": "Pavel Kohout and Arkadi Vainbrand discovered that Apache HTTP Server\nincorrectly handled certain memory operations in mod_authn_socache. A\nremote attacker could possibly use this issue to cause a denial of service.\n(CVE-2026-33007)\n\nHaruki Oyama, Merih Mengisteab, and Dawit Jeong discovered that Apache\nHTTP Server had an HTTP response splitting vulnerability in multiple\nmodules when used with untrusted or compromised backend servers. An\nattacker could possibly use this issue to inject arbitrary HTTP headers.\n(CVE-2026-33523)\n\nElhanan Haenel discovered that Apache HTTP Server incorrectly handled\ncertain memory operations in mod_proxy_ajp. A remote attacker could\npossibly use this issue to cause a denial of service. (CVE-2026-33857)\n\nTianshuo Han and J\u00e9r\u00f4me Djouder discovered that Apache HTTP Server\nincorrectly handled certain string operations in mod_proxy_ajp. A remote\nattacker could possibly use this issue to obtain sensitive information.\n(CVE-2026-34032)\n\nIt was discovered that Apache HTTP Server\u0027s mod_proxy_html module\nincorrectly handled certain content from an untrusted backend. A remote\nattacker could possibly use this issue to cause a denial of service.\n(CVE-2026-34355)\n\nIt was discovered that Apache HTTP Server incorrectly handled\nProxyPassReverseCookie directives with a malicious backend server. A\nremote attacker could possibly use this issue to cause a denial of service.\n(CVE-2026-34356)\n\nIt was discovered that Apache HTTP Server\u0027s mod_dav_fs module incorrectly\nhandled certain path operations. An authenticated user could possibly use\nthis issue to manipulate trusted WebDAV property databases or cause a\ndenial of service. (CVE-2026-42535)\n\nIt was discovered that Apache HTTP Server\u0027s mod_xml2enc module incorrectly\nhandled certain content from an untrusted backend. A remote attacker could\npossibly use this issue to cause a denial of service. (CVE-2026-42536)\n\nIt was discovered that Apache HTTP Server incorrectly handled response\nheaders when multiple content languages were configured. A remote\nattacker could possibly use this issue to obtain sensitive information.\n(CVE-2026-43951)\n\nIt was discovered that Apache HTTP Server incorrectly restricted certain\nfile functions in expressions within .htaccess files. A local attacker\nwith .htaccess write access could possibly use this issue to obtain\nsensitive information. (CVE-2026-44119)\n\nIt was discovered that Apache HTTP Server\u0027s mod_ssl module incorrectly\nhandled OCSP responses from an attacker-controlled server. A remote\nattacker could possibly use this issue to obtain sensitive information or\ncause a denial of service. (CVE-2026-44185)\n\nIt was discovered that Apache HTTP Server\u0027s mod_proxy_ftp module\nincorrectly handled responses from an attacker-controlled backend FTP\nserver. A remote attacker could possibly use this issue to cause a denial\nof service. (CVE-2026-44186)\n\nIt was discovered that Apache HTTP Server incorrectly handled crafted\nregular expressions in the server configuration. An attacker could\npossibly use this issue to execute arbitrary code or cause a denial of\nservice. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and\nUbuntu 20.04 LTS. (CVE-2026-44631)\n\nIt was discovered that Apache HTTP Server\u0027s mod_http2 module had a\nuse-after-free vulnerability when file handles were exhausted. A remote\nattacker could possibly use this issue to cause a denial of service. This\nissue only affected Ubuntu 20.04 LTS. (CVE-2026-48913)",
  "id": "USN-8571-1",
  "modified": "2026-07-20T19:03:33Z",
  "published": "2026-07-20T19:03:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8571-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33007"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33523"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33857"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34032"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34355"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34356"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42535"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42536"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-43951"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44119"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44185"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44186"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-44631"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-48913"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-49975"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "apache2 vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-33007",
    "UBUNTU-CVE-2026-33523",
    "UBUNTU-CVE-2026-33857",
    "UBUNTU-CVE-2026-34032",
    "UBUNTU-CVE-2026-34355",
    "UBUNTU-CVE-2026-34356",
    "UBUNTU-CVE-2026-42535",
    "UBUNTU-CVE-2026-42536",
    "UBUNTU-CVE-2026-43951",
    "UBUNTU-CVE-2026-44119",
    "UBUNTU-CVE-2026-44185",
    "UBUNTU-CVE-2026-44186",
    "UBUNTU-CVE-2026-44631",
    "UBUNTU-CVE-2026-48913",
    "UBUNTU-CVE-2026-49975"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

ubuntu-cve-2026-42536

Vulnerability from osv_ubuntu

CVE-2026-42536 (GCVE-0-2026-42536)

usn-8516-1

Vulnerability from osv_ubuntu

usn-8571-1

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature