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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.\nhttps://www.cve.org/CVERecord?id=CVE-2026-118656https://github.com/labstack/echo/security/advisories/GHSA-v753-g4cw-jm48https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5afhttps://github.com/labstack/echo/releases/tag/v4.16.0https://github.com/labstack/echo/releases/tag/v5.4.0#labstack #echo#CVE_2026_118656#bot", "url": "https://infosec.exchange/users/cve/statuses/117520400601382015"}, {"timestamp": "2026-10-28T21:04:22Z", "date_only": false, "value": "2026-10-28T21:04:22Z", "kind": "milestone", "label": "Published", "source": "github \u00b7 GHSA-V753-G4CW-JM48", "record": "GHSA-V753-G4CW-JM48", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-28T21:04:22Z", "date_only": false, "value": "2026-10-28T21:04:22Z", "kind": "other", "label": "Updated", "source": 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