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

What is CVE-2026-33006?

CVE-2026-33006 is a medium-severity authentication bypass vulnerability in Apache Http Server, published on 4 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-208

Which versions are affected by CVE-2026-33006?

1 open source package ship an affected version, including apache. It affects 1 product.

Products include Apache Http Server.

How do I fix CVE-2026-33006?

Upgrade apache to 2.4.67 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-33006 being exploited?

There is no known exploitation of CVE-2026-33006 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Apache Http Server

• CVE-2021-42013 Apache HTTP Server Path Traversal Exploited Critical 9.8
• CVE-2024-38475 Apache HTTP Server Improper Escaping of Output Exploited Critical 9.1
• CVE-2021-40438 Apache HTTP Server-Side Request Forgery (SSRF) Exploited Critical 9.0
• CVE-2019-0211 Apache HTTP Server Privilege Escalation Exploited High 7.8
• CVE-2021-41773 Apache HTTP Server Path Traversal Exploited High 7.5

All Apache Http Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2026-33006, AZL-86013, BELL-CVE-2026-33006, BIT-apache-2026-33006, DEBIAN-CVE-2026-33006, GHSA-r3x7-65m7-5p92 and 2 more.