CVE-2026-29169: CWE-476 NULL Pointer Dereference in Apache Software Foundation Apache HTTP Server
CVE-2026-29169 is a high-severity vulnerability in Apache HTTP Server versions 2.4.66 and earlier involving a NULL pointer dereference in the mod_dav_lock module. This flaw may allow an attacker to crash the server by sending a malicious request. The mod_dav_lock module is not used internally by mod_dav or mod_dav_fs, and its primary known use was with mod_dav_svn from Apache Subversion versions earlier than 1.2.0. Users are advised to upgrade to Apache HTTP Server version 2.4.66 or later, or alternatively remove the mod_dav_lock module to mitigate the issue.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-29169) is a NULL pointer dereference in the mod_dav_lock module of Apache HTTP Server 2.4.66 and earlier. Exploitation can cause a denial of service by crashing the server when processing a crafted request. The module mod_dav_lock is not used by default in mod_dav or mod_dav_fs, and its main usage was with mod_dav_svn from Apache Subversion prior to version 1.2.0. The recommended remediation is to upgrade to version 2.4.66 or remove the mod_dav_lock module.
Potential Impact
Successful exploitation results in a denial of service condition by crashing the Apache HTTP Server, impacting availability. There is no indication of confidentiality or integrity impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Users should upgrade to Apache HTTP Server version 2.4.66 or later, which addresses this vulnerability. If upgrading is not immediately possible, removing the mod_dav_lock module is recommended to prevent exploitation. Patch status is not explicitly confirmed in the advisory, but the recommendation to upgrade to 2.4.66 indicates a fix is available in that version.
CVE-2026-29169: CWE-476 NULL Pointer Dereference in Apache Software Foundation Apache HTTP Server
Description
CVE-2026-29169 is a high-severity vulnerability in Apache HTTP Server versions 2.4.66 and earlier involving a NULL pointer dereference in the mod_dav_lock module. This flaw may allow an attacker to crash the server by sending a malicious request. The mod_dav_lock module is not used internally by mod_dav or mod_dav_fs, and its primary known use was with mod_dav_svn from Apache Subversion versions earlier than 1.2.0. Users are advised to upgrade to Apache HTTP Server version 2.4.66 or later, or alternatively remove the mod_dav_lock module to mitigate the issue.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-29169) is a NULL pointer dereference in the mod_dav_lock module of Apache HTTP Server 2.4.66 and earlier. Exploitation can cause a denial of service by crashing the server when processing a crafted request. The module mod_dav_lock is not used by default in mod_dav or mod_dav_fs, and its main usage was with mod_dav_svn from Apache Subversion prior to version 1.2.0. The recommended remediation is to upgrade to version 2.4.66 or remove the mod_dav_lock module.
Potential Impact
Successful exploitation results in a denial of service condition by crashing the Apache HTTP Server, impacting availability. There is no indication of confidentiality or integrity impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Users should upgrade to Apache HTTP Server version 2.4.66 or later, which addresses this vulnerability. If upgrading is not immediately possible, removing the mod_dav_lock module is recommended to prevent exploitation. Patch status is not explicitly confirmed in the advisory, but the recommendation to upgrade to 2.4.66 indicates a fix is available in that version.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-03-04T11:50:32.014Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69f8b5f1cbff5d86102f7010
Added to database: 5/4/2026, 3:06:25 PM
Last enriched: 5/12/2026, 6:21:17 AM
Last updated: 6/18/2026, 12:24:16 PM
Views: 75
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