Vulnerability-Lookup

alsa-2026:21391

Vulnerability from osv_almalinux

Published

2026-05-27 00:00

Modified

2026-05-29 09:40

Summary

Important: httpd security update

Details

The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

Security Fix(es):

httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)
httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)
httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)
httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)
Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)

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-2026:21391	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-28780	REPORT
	https://access.redhat.com/security/cve/CVE-2026-33007	REPORT
	https://access.redhat.com/security/cve/CVE-2026-33857	REPORT
	https://access.redhat.com/security/cve/CVE-2026-34032	REPORT
	https://access.redhat.com/security/cve/CVE-2026-34059	REPORT
	https://bugzilla.redhat.com/2464940	REPORT
	https://bugzilla.redhat.com/2464952	REPORT
	https://bugzilla.redhat.com/2464953	REPORT
	https://bugzilla.redhat.com/2465299	REPORT
	https://bugzilla.redhat.com/2466913	REPORT
	https://errata.almalinux.org/9/ALSA-2026-21391.html	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:9",
        "name": "httpd"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
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            {
              "fixed": "2.4.62-13.el9_8.1"
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  ],
  "details": "The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.  \n\nSecurity Fix(es):  \n\n  * httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)\n  * httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)\n  * httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)\n  * httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)\n  * Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)\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-2026:21391",
  "modified": "2026-05-29T09:40:22Z",
  "published": "2026-05-27T00:00:00Z",
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      "url": "https://access.redhat.com/errata/RHSA-2026:21391"
    },
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      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-28780"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-33007"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-33857"
    },
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      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-34032"
    },
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      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-34059"
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      "url": "https://bugzilla.redhat.com/2464940"
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    },
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    },
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      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/9/ALSA-2026-21391.html"
    }
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    "CVE-2026-34032",
    "CVE-2026-33857",
    "CVE-2026-33007",
    "CVE-2026-28780"
  ],
  "summary": "Important: httpd security update"
}

CVE-2026-28780 (GCVE-0-2026-28780)

Vulnerability from cvelistv5 – Published: 2026-05-05 21:29 – Updated: 2026-05-06 15:50

Title

Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()

Summary

Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server. If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Severity

No CVSS data available.

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

apache

References

1 reference

URL	Tags
https://httpd.apache.org/security/vulnerabilities…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache HTTP Server	Affected: 0 , ≤ 2.4.66 (semver)

Credits

Andrew Lacambra Elhanan Haenel Tianshuo Han (<hantianshuo233@gmail.com>) Tristan Madani

Show details on NVD website

JSON

To clipboard

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CVE-2026-33007 (GCVE-0-2026-33007)

Vulnerability from cvelistv5 – Published: 2026-05-04 14:41 – Updated: 2026-05-05 15:07

Title

Apache HTTP Server: mod_authn_socache crash

Summary

A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an unauthenticated remote user to crash a child process in a caching forward proxy configuration. Users are recommended to upgrade to version 2.4.67, which fixes this issue.

Severity

No CVSS data available.

CWE

CWE-476 - NULL Pointer Dereference

Assigner

apache

References

1 reference

URL	Tags
https://httpd.apache.org/security/vulnerabilities…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache HTTP Server	Affected: 2.4.0 , ≤ 2.4.66 (semver)

Credits

Pavel Kohout, Aisle Research, Aisle.com Arkadi Vainbrand

Show details on NVD website

JSON

To clipboard

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CVE-2026-33857 (GCVE-0-2026-33857)

Vulnerability from cvelistv5 – Published: 2026-05-04 13:07 – Updated: 2026-05-04 17:32

Title

Apache HTTP Server: Off-by-one OOB reads in AJP getter functions

Summary

Out-of-bounds Read vulnerability in mod_proxy_ajp of Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Severity

No CVSS data available.

CWE

CWE-125 - Out-of-bounds Read

Assigner

apache

References

1 reference

URL	Tags
https://httpd.apache.org/security/vulnerabilities…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache HTTP Server	Affected: 0 , ≤ 2.4.66 (semver)

Credits

Elhanan Haenel

Show details on NVD website

JSON

To clipboard

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CVE-2026-34032 (GCVE-0-2026-34032)

Vulnerability from cvelistv5 – Published: 2026-05-04 12:54 – Updated: 2026-05-04 17:32

Title

Apache HTTP Server: mod_proxy_ajp: Heap Buffer Over-Read Due to Missing Null-Termination Check (ajp_msg_get_string)

Summary

Improper Null Termination, Out-of-bounds Read vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Severity

No CVSS data available.

CWE

CWE-170 - Improper Null Termination
CWE-125 - Out-of-bounds Read

Assigner

apache

References

1 reference

URL	Tags
https://httpd.apache.org/security/vulnerabilities…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache HTTP Server	Affected: 0 , ≤ 2.4.66 (semver)

Credits

Tianshuo Han (<hantianshuo233@gmail.com>) Jérôme Djouder

Show details on NVD website

JSON

To clipboard

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CVE-2026-34059 (GCVE-0-2026-34059)

Vulnerability from cvelistv5 – Published: 2026-05-04 12:39 – Updated: 2026-05-04 17:32

Title

Apache HTTP Server: mod_proxy_ajp: Heap Over-Read and memory disclosure in ajp_parse_data()

Summary

Buffer Over-read vulnerability in Apache HTTP Server. This issue affects Apache HTTP Server: through 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Severity

No CVSS data available.

CWE

CWE-126 - Buffer Over-read

Assigner

apache

References

1 reference

URL	Tags
https://httpd.apache.org/security/vulnerabilities…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache HTTP Server	Affected: 0 , ≤ 2.4.66 (semver)

Credits

Elhanan Haenel

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-2026:21391

Vulnerability from osv_almalinux

CVE-2026-28780 (GCVE-0-2026-28780)

CVE-2026-33007 (GCVE-0-2026-33007)

CVE-2026-33857 (GCVE-0-2026-33857)

CVE-2026-34032 (GCVE-0-2026-34032)

CVE-2026-34059 (GCVE-0-2026-34059)

Tags

Sightings

Nomenclature