CVE-2026-73637 Apache HTTP Server - Authentication Bypass

Apache HTTP Server < 2.4.69 contains a use after free vulnerability in mod_auth_digest caused by concurrent Digest authentication requests with AuthDigestNcCheck enabled or AuthDigestNonceLifetime set to 0, letting unauthenticated remote clients cause authentication state corruption.

CVSS base score 7.3 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.48% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Denial Of Service, Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published
1 October 2026
Updated
15 October 2026
Weakness
CWE-416

Vendor fix

Upgrade to version 2.4.69.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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