CVE-2026-65905

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.

We have discovered 5,640 live websites that are affected by CVE-2026-65905.

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Affected Software

Product	Apache Tomcat
Category	Web Servers
Vulnerable Domains	5,640 live websites (79% of Apache Tomcat install base)
Vulnerable Versions	from 7.0.30 through 7.0.109 from 8.5 through 8.5.100 from 9 through 9.0.120 from 10.1 through 10.1.57 from 11 through 11.0.24
Vulnerable Versions Count	287 versions ( 76% of all versions)