Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Echo v5 before 5.4.0 and Echo v4 before 4.16.0 let an unauthenticated attacker read files protected by route middleware, using encoded dot-dot segments on a static file route. This works when the static filesystem is mounted at a parent path. Upgrade to Echo v5 5.4.0 or Echo v4 4.16.0.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.9 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0035, the 28th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 28 Oct 2026, 19:59 UTC Confirmed by the CVE List
- 28 Oct 2026, 20:17 UTC Confirmed by NVD
- 31 Oct 2026, 14:11 UTC First seen by agentprime
- 31 Oct 2026, 14:11 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-3pmx-cf9f-34xr
- OSV: GHSA-3pmx-cf9f-34xr
- github.com/labstack/echo/security/advisories/GHSA-3pmx-cf9f-34xr
- github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1
- github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af
- github.com/labstack/echo
- github.com/labstack/echo/releases/tag/v4.16.0
- github.com/labstack/echo/releases/tag/v5.4.0