Description
Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Echo's static file handlers can normalize dot segments after route matching and serve a file through a public static route even though the corresponding direct path is protected by route-level middleware. An unauthenticated attacker can read files that an application intended to protect with route-level middleware, when those files are also reachable through a static filesystem mount after path normalization. This vulnerability is the result of an incomplete fix for CVE-2026-55677. This issue is fixed in 4.16.0 and 5.4.0.
References6
- github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087…
- github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b…
- github.com/labstack/echo/releases/tag/v4.16.0
- github.com/labstack/echo/releases/tag/v5.4.0
- github.com/labstack/echo/security/advisories/GHSA-3pmx-cf9f-34xr
- github.com/labstack/echo/security/advisories/GHSA-3pmx-cf9f-34xr
Metrics
- CVSS 3.1
-
5.9
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 0% percentile: 28 · as of 3 November 2026
- CWE
- CWE-22
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.