CVE-2026-65905

Critical

Description

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.

SeverityCritical
CVSS9.8
Exploit probability—
ProductApache Tomcat
PublishedAug 25, 2026
First seenAug 25, 2026
Weakness typeCWE-294CWE-294

How to fix

Update
  • apache tomcat9.0.121, 10.1.58, 11.0.25 or later
  • org.apache.tomcat:tomcat11.0.25, 10.1.58, 9.0.121 or later
  • org.apache.tomcat.embed:tomcat-embed-core11.0.25, 10.1.58, 9.0.121 or later
  • org.apache.tomcat:tomcat-catalina11.0.25, 10.1.58, 9.0.121 or later

Affected products

ProductAffected versionsFixed in
apache tomcat7.0.30 ≤ v ≤ 7.0.109, 8.5.0 ≤ v < 9.0.121, 10.1.0 ≤ v < 10.1.58, 11.0.0 ≤ v < 11.0.259.0.121, 10.1.58, 11.0.25
org.apache.tomcat:tomcatMaven11.0.0-M1 ≤ v < 11.0.25, 10.1.0-M1 ≤ v < 10.1.58, 9.0.0.M1 ≤ v < 9.0.121, 8.5.0 ≤ v ≤ 8.5.100, 7.0.30 ≤ v ≤ 7.0.10911.0.25, 10.1.58, 9.0.121
org.apache.tomcat.embed:tomcat-embed-coreMaven11.0.0-M1 ≤ v < 11.0.25, 10.1.0-M1 ≤ v < 10.1.58, 9.0.0.M1 ≤ v < 9.0.121, 8.5.0 ≤ v ≤ 8.5.100, 7.0.30 ≤ v ≤ 7.0.10911.0.25, 10.1.58, 9.0.121
org.apache.tomcat:tomcat-catalinaMaven11.0.0-M1 ≤ v < 11.0.25, 10.1.0-M1 ≤ v < 10.1.58, 9.0.0.M1 ≤ v < 9.0.121, 8.5.0 ≤ v ≤ 8.5.100, 7.0.30 ≤ v ≤ 7.0.10911.0.25, 10.1.58, 9.0.121

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