CVE-2026-118656

Name	CVE-2026-118656
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1152486

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
golang-github-labstack-echo (PTS)	bookworm	4.2.1-3	vulnerable
	forky, sid, trixie	4.12.0-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
golang-github-labstack-echo	source	(unstable)	(unfixed)			1152486

Notes

https://github.com/labstack/echo/security/advisories/GHSA-v753-g4cw-jm48
Fixed by: https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1 (v4.16.0)
Fixed by: https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af (v5.4.0)