{"id":"CVE-2026-41293","aliases":["BIT-tomcat-2026-41293","GHSA-r29c-68gh-xp6x"],"url":"https://o3.security/vulnerability/CVE-2026-41293","summary":"Apache Tomcat: HTTP/2 request headers not validated","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:\nHTTP/2 request headers were not validated which may have triggered\nunexpected application behaviour if the application (quite reasonably)\nassumed that header value exposed through the Servlet API would be\nspecification compliant.\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\n\nCredit:\nThis issue was identified by Dawit Jeong (@dawitngoliath)","published":"2026-05-12T15:19:35.179Z","modified":"2026-09-22T12:41:42.752224906Z","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":0.01563,"percentile":0.73138,"asOf":"2026-08-15"},"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-coyote","fixedVersion":"9.0.118"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","fixedVersion":"10.1.55"},{"ecosystem":"Maven","name":"org.apache.tomcat:tomcat-coyote","fixedVersion":"11.0.22"}],"fix":{"url":"https://github.com/apache/tomcat/commit/19f17a257797e8d139b33ff9c88d362a273be148","label":"apache/tomcat@19f17a2"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/05/12/13"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41293.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/qwg0q16z7xkb2qrr853wdll5531mvl1r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41293"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/19f17a257797e8d139b33ff9c88d362a273be148"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/1c70480466572c9192ed412ebefcd43fc63137fd"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/2a2476460e823789f530a22207873ea8cd6eff3b"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/3915fd27e6810b14ccd21e3d900bd8faef44d3df"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/57c2b3bfd62792631e1df24cf4237b990a0b36fa"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/c2925554c677da57390f940d856871e18daaacab"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/cf9452443bcbf3b1a4b435ef7d624364f1b65ca3"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/e5cef9618c3f4fd31bd6fb1e83f0f18022280dac"},{"type":"WEB","url":"https://github.com/apache/tomcat/commit/f72a6174ab1f0f5a053435f80448b4f6837fe6d7"},{"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":"2026-09-22T12:41:42.752224906Z"}}