What is CVE-2026-73637?

CVE-2026-73637 is a high-severity vulnerability in Apache Software Foundation HTTP Server, classified under Use After Free. CVSS score: 7.3/10. Published 2026-10-01.

How severe is CVE-2026-73637?

High severity. CVSS v3 base score is 7.3 out of 10.

Use After Free in Apache Software Foundation HTTP Server

CVE-2026-73637

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.

Vulnerability class: Use-After-Free

Published 2026-10-01 · last modified 2026-10-01.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Apache Software Foundation HTTP Server

Weakness classification (CWE)

CWE-416 — Use After Free

References

httpd.apache.org/security/vulnerabilities_24.html (vendor-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-73637?: CVE-2026-73637 is a high-severity vulnerability in Apache Software Foundation HTTP Server, classified under Use After Free. CVSS score: 7.3/10. Published 2026-10-01.
How severe is CVE-2026-73637?: High severity. CVSS v3 base score is 7.3 out of 10.