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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.

PUBLISHED Reserved 2026-03-04 | Published 2026-05-04 | Updated 2026-05-05 | Assigner apache

Problem types

CWE-476 NULL Pointer Dereference

Product status

Default status
unaffected

Any version
affected

Timeline

2026-03-04:Report received
2026-05-04:2.4.67 released
2026-05-04:fixed in 2.4.x by r1933354

Credits

Pavel Kohout, Aisle Research, Aisle.com finder

References

www.openwall.com/lists/oss-security/2026/05/04/20

www.openwall.com/lists/oss-security/2026/05/05/12

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

cve.org (CVE-2026-29169)

nvd.nist.gov (CVE-2026-29169)

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