CVE-2026-73636: CWE-294 Authentication Bypass by Capture-replay in Apache Software Foundation Apache HTTP Server
CVE-2026-73636 is an authentication bypass vulnerability in Apache HTTP Server 2.4.x affecting versions from 2.4.0 up to and including 2.4.68. The flaw exists in the mod_auth_digest module, where an attacker performing a man-in-the-middle attack can replay captured digest authentication credentials. This is possible when the AuthDigestNonceLifetime setting is configured to 0, triggering garbage collection of the client's shared memory entry. The issue is fixed in Apache HTTP Server version 2.4.69.
AI Analysis
Technical Summary
This vulnerability allows an attacker to bypass authentication by replaying captured digest authentication credentials in Apache HTTP Server's mod_auth_digest module. The attack exploits a condition where the AuthDigestNonceLifetime is set to 0, causing the server to garbage collect the client's shared memory entry, enabling replay of credentials. Affected versions include all 2.4.x releases from 2.4.0 through 2.4.68. The Apache Software Foundation has addressed this issue in version 2.4.69.
Potential Impact
An attacker capable of performing a man-in-the-middle attack can replay previously captured digest authentication credentials to bypass authentication controls. This could allow unauthorized access to resources protected by digest authentication in affected Apache HTTP Server versions.
Mitigation Recommendations
Users should upgrade to Apache HTTP Server version 2.4.69 or later, which contains the official fix for this vulnerability. No other mitigations are specified.
CVE-2026-73636: CWE-294 Authentication Bypass by Capture-replay in Apache Software Foundation Apache HTTP Server
Description
CVE-2026-73636 is an authentication bypass vulnerability in Apache HTTP Server 2.4.x affecting versions from 2.4.0 up to and including 2.4.68. The flaw exists in the mod_auth_digest module, where an attacker performing a man-in-the-middle attack can replay captured digest authentication credentials. This is possible when the AuthDigestNonceLifetime setting is configured to 0, triggering garbage collection of the client's shared memory entry. The issue is fixed in Apache HTTP Server version 2.4.69.
Affected software
Apache Software Foundation
Apache HTTP Server
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability allows an attacker to bypass authentication by replaying captured digest authentication credentials in Apache HTTP Server's mod_auth_digest module. The attack exploits a condition where the AuthDigestNonceLifetime is set to 0, causing the server to garbage collect the client's shared memory entry, enabling replay of credentials. Affected versions include all 2.4.x releases from 2.4.0 through 2.4.68. The Apache Software Foundation has addressed this issue in version 2.4.69.
Potential Impact
An attacker capable of performing a man-in-the-middle attack can replay previously captured digest authentication credentials to bypass authentication controls. This could allow unauthorized access to resources protected by digest authentication in affected Apache HTTP Server versions.
Mitigation Recommendations
Users should upgrade to Apache HTTP Server version 2.4.69 or later, which contains the official fix for this vulnerability. No other mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-08-13T12:47:45.798Z
- State
- PUBLISHED
Threat ID: 6abe8b02a43b0b3b89c7c758
Added to database: 10/01/2026, 16:32:02 UTC
Last enriched: 10/01/2026, 16:47:19 UTC
Last updated: 10/01/2026, 17:02:13 UTC
Views: 5
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