Vulnerability · Published Oct 28, 2026 · Assigned by GitHub_M
CVE-2026-118266Echo: CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method
Medium 5.3
In plain English
A medium-severity cross-site request forgery in echo from labstack. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% 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, Echo's MethodOverride middleware accepts a safe HTTP method as the override target for a POST request. When MethodOverride is registered before CSRF in the post-routing middleware chain, route selection retains the original state-changing POST handler but the override changes the method before CSRF evaluates it, causing both token validation and Sec-Fetch-Site checks to be skipped. A cross-site exploit requires an authenticated victim and an override value that a browser-submitted request can control, such as the form getter used by the advisory reproducer; the default X-HTTP-Method-Override header getter is not settable by a cross-site form. 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-2026-118266 |
| Debian:13 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-118266 |
| Debian:14 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-118266 |
| Go | github.com/labstack/echo/v4 | 4.16.0 | GO-2026-6877 |
| Go | github.com/labstack/echo/v4 | 4.16.0 | GHSA-r7w9-592q-9vg4 |
| Go | github.com/labstack/echo/v5 | 5.4.0 | GHSA-r7w9-592q-9vg4 |
| Go | github.com/labstack/echo/v5 | 5.4.0 | GO-2026-6877 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118266 |
| Ubuntu:24.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118266 |
| Ubuntu:26.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118266 |
| Ubuntu:26.10 | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118266 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo.v2 | no fix listed | UBUNTU-CVE-2026-118266 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo.v3 | no fix listed | UBUNTU-CVE-2026-118266 |
Affected products (as reported)
Weakness: CWE-352 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
References
- https://github.com/labstack/echo/security/advisories/GHSA-r7w9-592q-9vg4 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