CVE-2026-55957 Apache Tomcat - Authentication bypass with JNDIRealm and
GSSAPI authenticated bind
Severity: Important
Vendor: The Apache Software Foundation
Versions Affected:
Apache Tomcat 11.0.0-M1 to 11.0.4
Apache Tomcat 10.1.0-M1 to 10.1.36
Apache Tomcat 9.0.0.M1 to 9.0.100
Older, unsupported versions may also be affected
Description:
If security constraints were specified for the default servlet, any
method or method omission configured as part of the constraint was ignored.
Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 11.0.5 or later
- Upgrade to Apache Tomcat 10.1.37 or later
- Upgrade to Apache Tomcat 9.0.101 or later
Credit:
This issue was identified by:
- Ilan Toyter
History:
2026-06-29 Original advisory
References:
[1] https://tomcat.apache.org/security-11.html
[2] https://tomcat.apache.org/security-10.html
[3] https://tomcat.apache.org/security-9.html
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
