CVE-2026-29169

High

Description

A NULL pointer dereference in mod_dav_lock in Apache HTTP Server 2.4.66 and earlier may allow an attacker to crash the server with a malicious request.mod_dav_lock is not used internally by mod_dav or mod_dav_fs. The only known use-case for mod_dav_lock was mod_dav_svn from Apache Subversion earlier than version 1.2.0. Users are recommended to upgrade to version 2.4.66, which fixes this issue, or remove mod_dav_lock.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Apache Http Server

PublishedMay 4, 2026

First seenMay 4, 2026

Weakness typeCWE-476NULL pointer dereference

How to fix

Update

apache http_server2.4.67 or later

Vendor advisories

httpd.apache.org/security/vulnerabilities_24.html

Affected products

Product	Affected versions	Fixed in
apache http_server	v < 2.4.67	2.4.67

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