CVE-2026-65905

Authentication Bypass by Capture-replay vulnerability in Apache Tomcats DIGEST authenticator. If, before windowSize requests have been made, a client makes a DIGEST authenticated request with a nonceCount on the upper boundary of the replay window then that request is replayable once only while the associated nonceCount remains within the replay window.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120.

The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.30 through 7.0.109. Other unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.

Weakness

A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).

Affected Software

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/102.html
• https://cwe.mitre.org/data/definitions/509.html
• https://cwe.mitre.org/data/definitions/555.html
• https://cwe.mitre.org/data/definitions/561.html
• https://cwe.mitre.org/data/definitions/60.html
• https://cwe.mitre.org/data/definitions/644.html
• https://cwe.mitre.org/data/definitions/645.html
• https://cwe.mitre.org/data/definitions/652.html
• https://cwe.mitre.org/data/definitions/701.html
• https://cwe.mitre.org/data/definitions/94.html

References

• https://lists.apache.org/thread/9v114xlpgbzrrbzz5vf9f6r2q4wnxwwj
• http://www.openwall.com/lists/oss-security/2026/08/26/4