{"id":"CVE-2026-55955","aliases":["BIT-tomcat-2026-55955","GHSA-c5ph-rghf-fjfj"],"url":"https://o3.security/vulnerability/CVE-2026-55955","summary":"Apache Tomcat: EncryptInterceptor not protected against replay attacks","details":"Improper Authentication vulnerability in Apache Tomcat allowed a replay attack against the EncryptionInterceptor in the cluster component.\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.13 through 9.0.18, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109.\n\nUsers are recommended to upgrade to version 11.0.23, 10.1.56, 9.0.119, which fixes the issue.","published":"2026-06-29T20:44:39.779Z","modified":"2026-11-04T16:55:34.284151455Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"11.0.23"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"10.1.56"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":"9.0.119"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":null},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat","fixedVersion":null},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-tribes","fixedVersion":"11.0.23"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-tribes","fixedVersion":"10.1.56"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-tribes","fixedVersion":"9.0.119"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-tribes","fixedVersion":null},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-tribes","fixedVersion":null}],"fix":{"url":"https://github.com/apache/tomcat/commit/3a9ff01d2dfaca651edacbda3260e37b98b540d3","label":"apache/tomcat@3a9ff01"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/06/29/24"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55955.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/g4p5sf45p3f9r011pwqs9r54yd64s106"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55955"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/3a9ff01d2dfaca651edacbda3260e37b98b540d3"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/5e594400c7f6ac0eaf2526bd64442a70f5ccaace"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/6a7a432cd7fb4ef358dc12e8da99cf3ab320f3fe"},{"type":"PACKAGE","url":"https://github.com/apache/tomcat"},{"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":"2026-11-04T16:55:34.284151455Z"}}