Apache Tomcat JNDI Realm Auth Bypass before 11.0.27/10.1.61/9.0.123
CVE-2026-101296 Published on October 20, 2026
Apache Tomcat: JNDIRealm bind credential validation fails open for non-GSSAPI SASL mechanisms
A missing critical step in authentication vulnerability in Apache Tomcat when the JNDI realm was configured with with a non GSSAPI SASL authentication mechanism allowed attackers to authenticate without providing the correct password.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.26, from 10.1.0-M1 through 10.1.60, from 9.0.0.M1 through 9.0.122.
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 7.0.0 through 7.0.109. Other unsupported versions may also be affected.
Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fix the issue.
Vulnerability Analysis
CVE-2026-101296 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Missing Critical Step in Authentication
The software implements an authentication technique, but it skips a step that weakens the technique. Authentication techniques should follow the algorithms that define them exactly, otherwise authentication can be bypassed or more easily subjected to brute force attacks.
Products Associated with CVE-2026-101296
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Affected Versions
Apache Software Foundation Apache Tomcat:- Version 11.0.0-M1, <= 11.0.26 is affected.
- Version 10.1.0-M1, <= 10.1.60 is affected.
- Version 9.0.0.M1, <= 9.0.122 is affected.
- Version 8.5.0, <= 8.5.100 is affected.
- Version 7.0.0, <= 7.0.109 is affected.