{"id":"CVE-2026-118656","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-118656","summary":"Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, sanitizeURI checks only the first two bytes of a redirect target before deciding whether it begins with an absolute-path separator…","details":"Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, sanitizeURI checks only the first two bytes of a redirect target before deciding whether it begins with an absolute-path separator pair. When AddTrailingSlash or RemoveTrailingSlash is configured with a redirect status, a slash, TAB, separator path form can evade the guard, be emitted in the Location header, and be normalized by a browser into an attacker-controlled host. This issue is fixed in 4.16.0 and 5.4.0.","published":"2026-10-28T21:16:55.550","modified":"2026-10-28T21:16:55.550","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1","label":"labstack/echo@b838391"},"references":[{"type":"WEB","url":"https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1"},{"type":"WEB","url":"https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af"},{"type":"WEB","url":"https://github.com/labstack/echo/releases/tag/v4.16.0"},{"type":"WEB","url":"https://github.com/labstack/echo/releases/tag/v5.4.0"},{"type":"WEB","url":"https://github.com/labstack/echo/security/advisories/GHSA-v753-g4cw-jm48"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T21:16:55.550"}}