Vulnerability-Lookup

alsa-2026:34355

Vulnerability from osv_almalinux

Published

2026-07-01 00:00

Modified

2026-07-02 08:48

Summary

Moderate: mod_http2 security, bug fix, and enhancement update

Details

The mod_h2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers.

Security Fix(es):

httpd: mod_http2: Apache HTTP Server mod_http2: Use After Free vulnerability allows arbitrary code execution or denial of service. (CVE-2026-48913)
httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime (CVE-2026-43951)

Bug Fix(es) and Enhancement(s):

address CVE-2026-43951 and CVE-2026-48913 in mod_http2 (JIRA:AlmaLinux-188008)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:34355	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-43951	REPORT
	https://access.redhat.com/security/cve/CVE-2026-48913	REPORT
	https://bugzilla.redhat.com/2486405	REPORT
	https://bugzilla.redhat.com/2486415	REPORT
	https://errata.almalinux.org/10/ALSA-2026-34355.html	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:10",
        "name": "mod_http2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.29-4.el10_2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "The mod_h2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers.  \n\nSecurity Fix(es):  \n\n  * httpd: mod_http2: Apache HTTP Server mod_http2: Use After Free vulnerability allows arbitrary code execution or denial of service. (CVE-2026-48913)\n  * httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime (CVE-2026-43951)\n\n\nBug Fix(es) and Enhancement(s):  \n\n  * address CVE-2026-43951 and CVE-2026-48913 in mod_http2 (JIRA:AlmaLinux-188008)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:34355",
  "modified": "2026-07-02T08:48:30Z",
  "published": "2026-07-01T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:34355"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-43951"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-48913"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2486405"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2486415"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/10/ALSA-2026-34355.html"
    }
  ],
  "related": [
    "CVE-2026-48913",
    "CVE-2026-43951",
    "CVE-2026-43951",
    "CVE-2026-48913"
  ],
  "summary": "Moderate: mod_http2 security, bug fix, and enhancement update"
}

CVE-2026-43951 (GCVE-0-2026-43951)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:16 – Updated: 2026-06-08 22:32

Title

Apache HTTP Server: OOB Read in `merge_response_headers` can cause crash

Summary

Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response languages. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

apache

References

2 references

URL	Tags
https://httpd.apache.org/security/vulnerabilities…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache HTTP Server	Affected: 2.4.0 , ≤ 2.4.67 (semver)

Credits

Zhenpeng (Leo) Lin at depthfirst

Show details on NVD website

JSON

To clipboard

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CVE-2026-48913 (GCVE-0-2026-48913)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:24 – Updated: 2026-06-08 22:32

Title

Apache HTTP Server: mod_http2 memory corruption when file handles exhausted

Summary

Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already exhausted. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.67.

Severity

7.3 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-416 - Use After Free

Assigner

apache

References

2 references

URL	Tags
https://httpd.apache.org/security/vulnerabilities…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache HTTP Server	Affected: 2.4.55 , ≤ 2.4.67 (semver)

Credits

Sam Lovejoy, IBM X-Force Offensive Research (XOR)

Show details on NVD website

JSON

To clipboard

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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.

Action not permitted

alsa-2026:34355

Vulnerability from osv_almalinux

CVE-2026-43951 (GCVE-0-2026-43951)

CVE-2026-48913 (GCVE-0-2026-48913)

Tags

Sightings

Nomenclature