{"id":"UBUNTU-CVE-2023-45648","details":"Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 did not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.","modified":"2026-07-15T19:45:20.110862166Z","published":"2023-10-10T19:15:00Z","related":["USN-7106-1","USN-7562-1"],"upstream":["CVE-2023-45648"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-45648"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2023/10/10/10"},{"type":"REPORT","url":"https://lists.apache.org/thread/2pv8yz1pyp088tsxfb7ogltk9msk0jdp"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2023/10/10/10"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-45648"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7106-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7562-1"}],"affected":[{"package":{"name":"tomcat6","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tomcat6?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.0.37-1","6.0.39-1","6.0.39-1ubuntu0.1","6.0.39-1ubuntu0.1+esm1","6.0.39-1ubuntu0.1+esm2","6.0.39-1ubuntu0.1+esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"libservlet2.4-java"},{"binary_name":"libservlet2.5-java","binary_version":"6.0.39-1ubuntu0.1+esm3"},{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"libtomcat6-java"},{"binary_name":"tomcat6","binary_version":"6.0.39-1ubuntu0.1+esm3"},{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"tomcat6-admin"},{"binary_name":"tomcat6-common","binary_version":"6.0.39-1ubuntu0.1+esm3"},{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"tomcat6-docs"},{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"tomcat6-examples"},{"binary_name":"tomcat6-extras","binary_version":"6.0.39-1ubuntu0.1+esm3"},{"binary_version":"6.0.39-1ubuntu0.1+esm3","binary_name":"tomcat6-user"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-45648.json"}},{"package":{"name":"tomcat7","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tomcat7?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.0.42-1","7.0.47-1","7.0.50-1","7.0.52-1","7.0.52-1ubuntu0.1","7.0.52-1ubuntu0.3","7.0.52-1ubuntu0.6","7.0.52-1ubuntu0.7","7.0.52-1ubuntu0.8","7.0.52-1ubuntu0.9","7.0.52-1ubuntu0.10","7.0.52-1ubuntu0.11","7.0.52-1ubuntu0.13","7.0.52-1ubuntu0.14","7.0.52-1ubuntu0.15","7.0.52-1ubuntu0.16","7.0.52-1ubuntu0.16+esm1","7.0.52-1ubuntu0.16+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"libservlet3.0-java","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_name":"libtomcat7-java","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_name":"tomcat7","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_name":"tomcat7-admin","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_version":"7.0.52-1ubuntu0.16+esm2","binary_name":"tomcat7-common"},{"binary_name":"tomcat7-docs","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_name":"tomcat7-examples","binary_version":"7.0.52-1ubuntu0.16+esm2"},{"binary_name":"tomcat7-user","binary_version":"7.0.52-1ubuntu0.16+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-45648.json"}},{"package":{"name":"tomcat8","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/tomcat8?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.0.26-1","8.0.28-1","8.0.30-1","8.0.32-1","8.0.32-1ubuntu1","8.0.32-1ubuntu1.1","8.0.32-1ubuntu1.2","8.0.32-1ubuntu1.3","8.0.32-1ubuntu1.4","8.0.32-1ubuntu1.5","8.0.32-1ubuntu1.6","8.0.32-1ubuntu1.7","8.0.32-1ubuntu1.8","8.0.32-1ubuntu1.9","8.0.32-1ubuntu1.10","8.0.32-1ubuntu1.11","8.0.32-1ubuntu1.13","8.0.32-1ubuntu1.13+esm1","8.0.32-1ubuntu1.13+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"8.0.32-1ubuntu1.13+esm2","binary_name":"libservlet3.1-java"},{"binary_name":"libtomcat8-java","binary_version":"8.0.32-1ubuntu1.13+esm2"},{"binary_name":"tomcat8","binary_version":"8.0.32-1ubuntu1.13+esm2"},{"binary_name":"tomcat8-admin","binary_version":"8.0.32-1ubuntu1.13+esm2"},{"binary_version":"8.0.32-1ubuntu1.13+esm2","binary_name":"tomcat8-common"},{"binary_version":"8.0.32-1ubuntu1.13+esm2","binary_name":"tomcat8-docs"},{"binary_name":"tomcat8-examples","binary_version":"8.0.32-1ubuntu1.13+esm2"},{"binary_version":"8.0.32-1ubuntu1.13+esm2","binary_name":"tomcat8-user"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-45648.json"}},{"package":{"name":"tomcat7","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/tomcat7?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.0.64-1","7.0.68-1","7.0.68-1ubuntu0.1","7.0.68-1ubuntu0.3","7.0.68-1ubuntu0.4","7.0.68-1ubuntu0.4+esm1","7.0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