Medium [CVE-2026-65905] Authentication bypass via limited replay attack in DIGEST authenticator
This medium-severity Red Hat Linux advisory covers CVE-2026-65905 affecting Red Hat JBoss Web Server 6.2.5, Red Hat JBoss Web Server 6.2 on RHEL 10, Red Hat JBoss Web Server 6.2 on RHEL 8.
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Summary
Authentication Bypass by Capture-replay vulnerability in Apache Tomcat's 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.
A remote attacker can exploit this by making a specially crafted DIGEST authenticated request with a nonceCount at the upper boundary of the replay window. This allows the attacker to replay the request once, potentially bypassing authentication.
This vulnerability affects configurations utilizing DIGEST authentication. Red Hat severity: Moderate — CVSS 4.8 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).
Weakness: CWE-294.
- 11.0.0
- 11.0.24
- 10.1.0
- 10.1.57
- 9.0.0
- 9.0.120
- 8.5.0
- 8.5.100
- 7.0.30
- 7.0.109
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
- 11.0.25
- 10.1.58
- 9.0.121
- tomcat
- jws6-tomcat-0:10.1.49-16.redhat_00016.1.el10jws
- jws6-tomcat-0:10.1.49-16.redhat_00016.1.el8jws
- jws6-tomcat-0:10.1.49-16.redhat_00016.1.el9jws
- tomcat11-main-11.0.25-0.1.hum1
- tomcat10-main-10.1.59-0.1.hum1
- RHSA-2026:73982
- RHSA-2026:73981
- RHSA-2026:56039
- RHSA-2026:63137
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Mitigation checklist
- To mitigate this issue, disable DIGEST authentication in Apache Tomcat if it is not a required authentication mechanism for your deployment. Refer to the Apache Tomcat documentation for guidance on configuring authentication methods. Disabling DIGEST authentication will affect services that depend on it. A restart of the Tomcat service is necessary for the configuration changes to be applied.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
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