{"id":"UBUNTU-CVE-2026-45135","details":"Caddy is an extensible server platform that uses TLS by default. From 2.7.0 until 2.11.3, the FastCGI transport's splitPos() in modules/caddyhttp/reverseproxy/fastcgi/fastcgi.go misuses golang.org/x/text/search with search.IgnoreCase when the request path contains a non-ASCII byte. Two distinct flaws in that fallback let an attacker mislead Caddy's FastCGI splitting into treating a non-.php (or other configured split_path extension) file as a script. In any deployment where the attacker can place content into a file served via FastCGI (uploads, file storage, etc.), this can be escalated to remote code execution by crafting a URL whose path triggers either flaw. This vulnerability is fixed in 2.11.3.","modified":"2026-07-02T18:03:14.062586669Z","published":"2026-06-23T18:17:00Z","upstream":["CVE-2026-45135"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-45135"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-45135"}],"affected":[{"package":{"name":"caddy","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/caddy?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.2-6","2.6.2-6ubuntu0.24.04.1","2.6.2-6ubuntu0.24.04.2","2.6.2-6ubuntu0.24.04.2+esm1","2.6.2-6ubuntu0.24.04.3","2.6.2-6ubuntu0.24.04.3+esm1","2.6.2-6ubuntu0.24.04.3+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.6.2-6ubuntu0.24.04.3+esm2","binary_name":"caddy"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45135.json"}},{"package":{"name":"caddy","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/caddy?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.2-9","2.6.2-11","2.6.2-12"],"ecosystem_specific":{"binaries":[{"binary_name":"caddy","binary_version":"2.6.2-12"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45135.json"}},{"package":{"name":"caddy","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/caddy?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.2-12","2.6.2-14","2.6.2-14ubuntu0.26.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.6.2-14ubuntu0.26.04.1~esm1","binary_name":"caddy"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45135.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}