CVE-2026-33006: Apache HTTP Server: mod_auth_digest timing attack

[Eric Covener <covener () apache org>]

Severity: moderate 

Affected versions:

- Apache HTTP Server through 2.4.66

Description:

A timing attack against mod_auth_digest in Apache HTTP Server 2.4.66 allows a bypass of Digest authentication by a 
remote attacker.

Users are recommended to upgrade to version 2.4.67, which fixes this issue.

Credit:

Nitescu Lucian (finder)

References:

https://httpd.apache.org/security/vulnerabilities_24.html
https://httpd.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-33006

Timeline:

2026-03-09: Report received
2026-05-04: 2.4.67 released
2026-05-04: fixed in 2.4.x by r1933356