Apache Tomcat - Digest authenticator will authenticate any unknown user
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
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-43512US | — | Exploit | ||
DEPRECATED: Authentication Bypass Issues vulnerability in digest authentication in Apache Tomcat.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1… | ||||
references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2026/05/12/8WEB
- https://github.com/apache/tomcat/commit/3d4d3fae07a6cd9c2eb193c5491001740ec64448WEB
- https://github.com/apache/tomcat/commit/6565a6cb6499e56fe2f34457cec99f9d1c4f39e9WEB
- https://github.com/apache/tomcat/commit/a99c355e8199adbfd67c9a1fffbd85b810b196cdWEB
- https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-43512ADVISORY
- https://tomcat.apache.org/security-10.htmlWEB
- https://tomcat.apache.org/security-11.htmlWEB
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