Authentication Bypass in Apache HTTP Server by Apache Software Foundation
CVE-2026-73636

8.1HIGH

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
1 October 2026

What is CVE-2026-73636?

A vulnerability in mod_auth_digest of Apache HTTP Server 2.4.x can be exploited through an authentication bypass. This occurs when an attacker executes a man-in-the-middle (MITM) attack to replay captured digest authentication credentials. The exploitation is facilitated by crafted requests that induce garbage collection in the client's shared memory entry, particularly when the AuthDigestNonceLifetime is set to 0. It is essential for users to upgrade to version 2.4.69 to mitigate this risk.

Affected Version(s)

Apache HTTP Server 2.4.0 <= 2.4.68

References

https://httpd.apache.org/security/vulnerabilities_24.html
vendor-advisory

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Hyojae Lee
.