Vulnerability · Published Oct 28, 2026 · Assigned by GitHub_M
CVE-2026-118655Echo: Static Middleware Double-Unescape Path Traversal
Medium 5.9
In plain English
A medium-severity security flaw 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 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-118655 |
| Debian:13 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-118655 |
| Debian:14 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-118655 |
| Go | github.com/labstack/echo/v4 | 4.15.3 | GO-2026-6885 |
| Go | github.com/labstack/echo/v4 | 4.15.3 | GHSA-xwq5-6cqp-vx96 |
| Go | github.com/labstack/echo/v5 | 5.2.0 | GHSA-xwq5-6cqp-vx96 |
| Go | github.com/labstack/echo/v5 | 5.2.0 | GO-2026-6885 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118655 |
| Ubuntu:24.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118655 |
| Ubuntu:26.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118655 |
| Ubuntu:26.10 | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-118655 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo.v2 | no fix listed | UBUNTU-CVE-2026-118655 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo.v3 | no fix listed | UBUNTU-CVE-2026-118655 |
Affected products (as reported)
Weakness: CWE-174 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/labstack/echo/security/advisories/GHSA-xwq5-6cqp-vx96 x_refsource_CONFIRM
- https://github.com/labstack/echo/issues/2599 x_refsource_MISC
- https://github.com/labstack/echo/pull/3006 x_refsource_MISC
- https://github.com/labstack/echo/commit/a9ede66a5a7196411131beb1ee801e75bbaf7ac6 x_refsource_MISC
- https://github.com/labstack/echo/commit/c3fa2a27ff92b2b8db360de614f999ef1da24725 x_refsource_MISC
- https://github.com/labstack/echo/releases/tag/v4.15.3 x_refsource_MISC
- https://github.com/labstack/echo/releases/tag/v5.2.0 x_refsource_MISC