{"id":"CVE-2026-43512","aliases":["BIT-tomcat-2026-43512","GHSA-h6fc-48rj-7qqh"],"url":"https://o3.security/vulnerability/CVE-2026-43512","summary":"Apache Tomcat: Digest authenticator will authenticate any unknown user","details":"Versions Affected:\nApache Tomcat 11.0.0-M1 to 11.0.21\nApache Tomcat 10.1.0-M1 to 10.1.54\nApache Tomcat 9.0.0.M1 to 9.0.117\nOlder, unsupported versions may also be affected\n\nDescription:\nWhen DIGEST authentication was configured, any user not known to the\nconfigured Realm would be authenticated if they presented the password\n\"null\".\n\nMitigation:\nUsers of the affected versions should apply one of the following\nmitigations:\n- Upgrade to Apache Tomcat 11.0.22 or later\n- Upgrade to Apache Tomcat 10.1.55 or later\n- Upgrade to Apache Tomcat 9.0.118 or later","published":"2026-05-12T15:24:02.424Z","modified":"2026-09-22T12:41:41.998032076Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.01326,"percentile":0.69608,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","fixedVersion":"9.0.118"},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","fixedVersion":"10.1.55"},{"ecosystem":"Maven","name":"org.apache.tomcat.embed:tomcat-embed-core","fixedVersion":"11.0.22"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"9.0.118"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"10.1.55"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"11.0.22"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-catalina","fixedVersion":"9.0.118"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-catalina","fixedVersion":"10.1.55"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-catalina","fixedVersion":"11.0.22"}],"fix":{"url":"https://github.com/apache/tomcat/commit/3d4d3fae07a6cd9c2eb193c5491001740ec64448","label":"apache/tomcat@3d4d3fa"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/05/12/8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43512.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/7x09x7o12solvclslw3sz0288xc8wx73"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43512"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/3d4d3fae07a6cd9c2eb193c5491001740ec64448"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/6565a6cb6499e56fe2f34457cec99f9d1c4f39e9"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/a99c355e8199adbfd67c9a1fffbd85b810b196cd"},{"type":"WEB","url":"https://tomcat.apache.org/security-10.html"},{"type":"WEB","url":"https://tomcat.apache.org/security-11.html"},{"type":"WEB","url":"https://tomcat.apache.org/security-9.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-22T12:41:41.998032076Z"}}