CVE-2026-73637: Apache HTTP Server

High severity, CVSS 7.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests when AuthDigestNcCheck is enabled or AuthDigestNonceLifetime is set to 0. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Affected products

• Apache HTTP Server: from 2.4.0, before 2.4.69 (fixed in 2.4.69)

Published 2026-10-01. Last modified 2026-10-05.