CVE-2026-33006

Apache HTTP Server: mod_auth_digest timing attack

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.

Affected

Apache Software Foundation · Apache HTTP Server

CVSS v3.1 CNA

4.8 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS

0.56% chance of exploitation in the next 30 days, 45th percentile

Published

2026-05-04

Proof-of-concept exploits (1)

• SimoesCTT/CTT-enhanced-Apache-mod_auth_digest-timing-attack-exploit0★ · 2026-05-08

Security advisories

• https://httpd.apache.org/security/vulnerabilities_24.html
• http://www.openwall.com/lists/oss-security/2026/05/04/21

References

• CVE Record
• NVD entry

Related

• CVE-2014-0160
• CVE-2021-26855
• CVE-2022-0847
• CVE-2022-21820
• CVE-2022-22965
• CVE-2023-6246