What is CVE-2026-33006?

CVE-2026-33006 is a medium-severity vulnerability in Apache HTTP Server, classified under CWE-208. CVSS score: 4.8/10. Published 2026-05-04.

How severe is CVE-2026-33006?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Is CVE-2026-33006 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Apache HTTP Server

CVE-2026-33006

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.

Published 2026-05-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (60.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.010 · change: +0.004

Affected products

Apache HTTP Server
Apache Software Foundation HTTP Server — versions 0

Weakness classification (CWE)

CWE-208

Public proof-of-concept exploits

SimoesCTT/CTT-enhanced-Apache-mod_auth_digest-timing-attack-exploit

References

httpd.apache.org/security/vulnerabilities_24.html (vendor-advisory, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-33006?: CVE-2026-33006 is a medium-severity vulnerability in Apache HTTP Server, classified under CWE-208. CVSS score: 4.8/10. Published 2026-05-04.
How severe is CVE-2026-33006?: Medium severity. CVSS v3 base score is 4.8 out of 10.
Is CVE-2026-33006 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.