CVE-2026-29168

A flaw was found in the mod_md module of httpd. When processing OCSP (Online Certificate Status Protocol) responses from a malicious or compromised OCSP responder, the module fails to enforce proper size limits on the incoming data. This issue leads to memory exhaustion and a denial of service.

To exploit this flaw, the Apache HTTP Server must query an untrusted or compromised OCSP responder, limiting its exposure. Due to this reason, this vulnerability has been rated with a moderate severity.

This flaw only affects configurations with mod_md loaded and being used. This module can be disabled via the configuration file if its functionality is not being used.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Disabling mod_md and restarting httpd will mitigate this flaw.