Vulnerability · Published Oct 28, 2026 · Assigned by GitHub_M
CVE-2026-118656Echo: Open Redirect via Control-Character Prefix Defeating sanitizeURI
Medium 6.1
In plain English
A medium-severity open redirect in echo from labstack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-118656 |
| Debian:13 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-118656 |
| Debian:14 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-118656 |
| Go | github.com/labstack/echo/v4 | 4.16.0 | GO-2026-6883 |
| Go | github.com/labstack/echo/v4 | 4.16.0 | GHSA-v753-g4cw-jm48 |
| Go | github.com/labstack/echo/v5 | 5.4.0 | GHSA-v753-g4cw-jm48 |
| Go | github.com/labstack/echo/v5 | 5.4.0 | GO-2026-6883 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118656 |
| Ubuntu:24.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118656 |
| Ubuntu:26.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118656 |
| Ubuntu:26.10 | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118656 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo.v2 | no fix listed | UBUNTU-CVE-2026-118656 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo.v3 | no fix listed | UBUNTU-CVE-2026-118656 |
Affected products (as reported)
Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/labstack/echo/security/advisories/GHSA-v753-g4cw-jm48 x_refsource_CONFIRM
- https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1 x_refsource_MISC
- https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af x_refsource_MISC
- https://github.com/labstack/echo/releases/tag/v4.16.0 x_refsource_MISC
- https://github.com/labstack/echo/releases/tag/v5.4.0 x_refsource_MISC