# CVE-2026-118654: Echo static file middleware route protection bypass via encoded dot-dot traversal


- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 28 Oct 2026
- **Updated:** 28 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-118654, ECHO-5186-17a4-220d, GHSA-3pmx-cf9f-34xr, UBUNTU-CVE-2026-118654

## What is CVE-2026-118654?

CVE-2026-118654 is a medium-severity vulnerability in labstack echo, published on 28 Oct 2026. 

### Official 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.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-118654?

4 open source packages ship an affected version, including github.com/labstack/echo/v4 and github.com/labstack/echo/v5.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/labstack/echo/v4` | Go | All versions | 4.16.0 |
| `github.com/labstack/echo/v4` | Go | All versions | 4.16.0 |
| `github.com/labstack/echo/v5` | Go | All versions | 5.4.0 |
| `github.com/labstack/echo/v5` | Go | All versions | 5.4.0 |

## How do I fix CVE-2026-118654?

Upgrade github.com/labstack/echo/v4 to 4.16.0 or later.

## Is CVE-2026-118654 being exploited?

There is no known exploitation of CVE-2026-118654 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-118654 and fix it if it is affected.

What it is: CVE-2026-118654 is a medium-severity vulnerability in labstack echo, published on 28 Oct 2026. 
Exploitation: There is no known exploitation of CVE-2026-118654 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/labstack/echo/v4 (Go): affected all versions; fixed in 4.16.0
- github.com/labstack/echo/v4 (Go): affected all versions; fixed in 4.16.0
- github.com/labstack/echo/v5 (Go): affected all versions; fixed in 5.4.0
- github.com/labstack/echo/v5 (Go): affected all versions; fixed in 5.4.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-118654/ (Markdown: https://insights.sbomify.com/CVE-2026-118654/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-118654
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-118654
- OSV: https://osv.dev/vulnerability/CVE-2026-118654

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-118654/
Summaries are generated and may contain mistakes; the official description above is the record.