Open-source package vulnerability · Maven

CVE-2026-43512: Apache Tomcat - Digest authenticator will authenticate any unknown user

criticalCVSS 3.1 9.8GHSA-h6fc-48rj-7qqh

Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected Description: When DIGEST authentication was configured, any user not known to the configured Realm would be authenticated if they presented the password "null".

Published May 12, 2026 · Updated May 18, 2026

Affected packages

org.apache.tomcat.embed:tomcat-embed-core

Ecosystem: Maven
Affected: < 9.0.118
Fixed in: 9.0.118
Check: mvn dependency:tree -Dincludes=org.apache.tomcat.embed:tomcat-embed-core

org.apache.tomcat.embed:tomcat-embed-core

Ecosystem: Maven
Affected: >= 10.1.0-M1, < 10.1.55
Fixed in: 10.1.55
Check: mvn dependency:tree -Dincludes=org.apache.tomcat.embed:tomcat-embed-core

org.apache.tomcat.embed:tomcat-embed-core

Ecosystem: Maven
Affected: >= 11.0.0-M1, < 11.0.22
Fixed in: 11.0.22
Check: mvn dependency:tree -Dincludes=org.apache.tomcat.embed:tomcat-embed-core

org.apache.tomcat:tomcat

Ecosystem: Maven
Affected: < 9.0.118
Fixed in: 9.0.118
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat

org.apache.tomcat:tomcat

Ecosystem: Maven
Affected: >= 10.1.0-M1, < 10.1.55
Fixed in: 10.1.55
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat

org.apache.tomcat:tomcat

Ecosystem: Maven
Affected: >= 11.0.0-M1, < 11.0.22
Fixed in: 11.0.22
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat

org.apache.tomcat:tomcat-catalina

Ecosystem: Maven
Affected: < 9.0.118
Fixed in: 9.0.118
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat-catalina

org.apache.tomcat:tomcat-catalina

Ecosystem: Maven
Affected: >= 10.1.0-M1, < 10.1.55
Fixed in: 10.1.55
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat-catalina

org.apache.tomcat:tomcat-catalina

Ecosystem: Maven
Affected: >= 11.0.0-M1, < 11.0.22
Fixed in: 11.0.22
Check: mvn dependency:tree -Dincludes=org.apache.tomcat:tomcat-catalina

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected

Description: When DIGEST authentication was configured, any user not known to the configured Realm would be authenticated if they presented the password "null".

Mitigation: Users of the affected versions should apply one of the following mitigations:

Upgrade to Apache Tomcat 11.0.22 or later
Upgrade to Apache Tomcat 10.1.55 or later
Upgrade to Apache Tomcat 9.0.118 or later

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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