CRITICAL 9.8 Maven
Apache Tomcat - Digest authenticator will authenticate any unknown user
GHSA-h6fc-48rj-7qqh · BIT-tomcat-2026-43512 · CVE-2026-43512
Published · Modified
Description
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
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-43512
- WEB https://github.com/apache/tomcat/commit/3d4d3fae07a6cd9c2eb193c5491001740ec64448
- WEB https://github.com/apache/tomcat/commit/6565a6cb6499e56fe2f34457cec99f9d1c4f39e9
- WEB https://github.com/apache/tomcat/commit/a99c355e8199adbfd67c9a1fffbd85b810b196cd
- WEB https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73
- WEB https://tomcat.apache.org/security-10.html
- WEB https://tomcat.apache.org/security-11.html
- WEB https://tomcat.apache.org/security-9.html
- WEB http://www.openwall.com/lists/oss-security/2026/05/12/8
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