NULL Pointer Dereference in Apache HTTP Server Affecting mod_dav_lock
CVE-2026-29169

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
4 May 2026

What is CVE-2026-29169?

A vulnerability exists in the mod_dav_lock component of Apache HTTP Server 2.4.66 and prior versions, where a NULL pointer dereference could be triggered by a specially crafted request. This flaw has the potential to crash the affected server, posing a risk to service availability. The mod_dav_lock function is not actively utilized within mod_dav or mod_dav_fs, with its only noted application being in mod_dav_svn from earlier Apache Subversion versions. To mitigate this risk, users are advised to upgrade to Apache HTTP Server version 2.4.66 or remove the mod_dav_lock module altogether.

Affected Version(s)

Apache HTTP Server 0 <= 2.4.66

References

https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Pavel Kohout, Aisle Research, Aisle.com
.