CVE-2026-118650
Echo: middleware.Static: `%2F`-encoded path bypasses route/group middleware guarding a statically-served path
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.
Fixes and workarounds
Fix
github.com/labstack/echo/v5 (Go): OSV reports a fixed version 5.4.0. Check the advisory for supported release branches.
Source: OSV GHSA-375p-5qhx-8wq4Fix
github.com/labstack/echo/v4 (Go): OSV reports a fixed version 4.16.0. Check the advisory for supported release branches.
Source: OSV GHSA-375p-5qhx-8wq4Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| echo labstack |
>= 5.0.0, < 5.4.0 (affected) < 4.16.0 (affected) |
CNA: GitHub_M |
github.com/labstack/echo/v5github.com/labstack/echo/v5
Go |
≥ 0; < 5.4.0 (affected, semver); OSV events: introduced 0; fixed 5.4.0Source events (semver)Other versions: unaffected |
OSV GHSA-375p-5qhx-8wq4 |
github.com/labstack/echo/v4github.com/labstack/echo/v4
Go |
≥ 0; < 4.16.0 (affected, semver); OSV events: introduced 0; fixed 4.16.0Source events (semver)Other versions: unaffected |
OSV GHSA-375p-5qhx-8wq4 |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | CNA: GitHub_M |
Exploit evidence
- https://github.com/labstack/echo/security/advisories/GHSA-375p-5qhx-8wq4
exploit · ADP: CISA-ADP
References
- https://github.com/labstack/echo/security/advisories/GHSA-375p-5qhx-8wq4CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1CNA: GitHub_M · x_refsource_MISC
- https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5afCNA: GitHub_M · x_refsource_MISC
- https://github.com/labstack/echo/releases/tag/v4.16.0CNA: GitHub_M · x_refsource_MISC
- https://github.com/labstack/echo/releases/tag/v5.4.0CNA: GitHub_M · x_refsource_MISC
- https://github.com/labstack/echo/security/advisories/GHSA-375p-5qhx-8wq4ADP: CISA-ADP · exploit
- https://github.com/advisories/GHSA-375p-5qhx-8wq4OSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-375p-5qhx-8wq4OSV / GitHub Security Advisories · osv
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