{"id":"ALPINE-CVE-2026-27588","details":"Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `host` request matcher is documented as case-insensitive, but when configured with a large host list (\u003e100 entries) it becomes case-sensitive due to an optimized matching path. An attacker can bypass host-based routing and any access controls attached to that route by changing the casing of the `Host` header. Version 2.11.1 contains a fix for the issue.","modified":"2026-11-03T06:32:53.742872882Z","published":"2026-02-24T17:29:04.163Z","upstream":["CVE-2026-27588"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2026-27588"}],"affected":[{"package":{"name":"caddy","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/caddy?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.10.2"},{"fixed":"2.11.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-27588.json"}},{"package":{"name":"caddy","ecosystem":"Alpine:v3.24","purl":"pkg:apk/alpine/caddy?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.10.2"},{"fixed":"2.11.1-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-27588.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}