Vulnerability · Published Oct 28, 2026 · Assigned by GitHub_M
CVE-2026-118650Echo: middleware.Static: `%2F`-encoded path bypasses route/group middleware guarding a statically-served path
High 7.5
In plain English
A high-severity incorrect authorization in echo from labstack. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% 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, a globally mounted middleware.Static instance can interpret an encoded request path differently from Echo's router because the router matches the still-encoded path while the static handler uses the decoded URL.Path. The advisory demonstrates an encoded slash resolving to a file under the static root through the global static middleware, but the source is internally inconsistent about whether a route or group guard protects the corresponding literal path in that global-mount configuration. This issue is fixed in 4.16.0 and 5.4.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/labstack/echo/v4 | 4.16.0 | GHSA-375p-5qhx-8wq4 |
| Go | github.com/labstack/echo/v4 | 4.16.0 | GO-2026-6873 |
| Go | github.com/labstack/echo/v5 | 5.4.0 | GO-2026-6873 |
| Go | github.com/labstack/echo/v5 | 5.4.0 | GHSA-375p-5qhx-8wq4 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118650 |
| Ubuntu:24.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118650 |
| Ubuntu:26.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118650 |
| Ubuntu:26.10 | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118650 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo.v2 | no fix listed | UBUNTU-CVE-2026-118650 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo.v3 | no fix listed | UBUNTU-CVE-2026-118650 |
Affected products (as reported)
Weakness: CWE-177, CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/labstack/echo/security/advisories/GHSA-375p-5qhx-8wq4 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