CVE-2026-118654

Echo static file middleware route protection bypass via encoded dot-dot traversal

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.

Affected

labstack · echo

CVSS v3.1 GITHUB

5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.35% chance of exploitation in the next 30 days, 28th percentile

Published

2026-10-28

Updated

2026-11-02

Proof-of-concept exploits (1)

• advisories/GHSA-3pmx-cf9f-34xrfind archive

CVE references

• labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1REFERENCE
• labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5afREFERENCE
• labstack/echo/releases/tag/v4.16.0REFERENCE
• labstack/echo/releases/tag/v5.4.0REFERENCE
• labstack/echo/security/advisories/GHSA-3pmx-cf9f-34xrREFERENCE

References

• CVE Record
• NVD entry