# CVE-2026-25766: Echo has a Windows path traversal via backslash in middleware.Static default filesystem

Source: https://junglewise.ai/threats/cve-2026-25766-echo-has-a-windows-path-traversal-via-backslash-in-middleware  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-26  
License: CC BY 4.0 with a link back

CVE-2026-25766 · Severity: low · CVSS 3.1 · Published 2026-02-26

Echo has a Windows path traversal via backslash in middleware.Static default filesystem in github.com/labstack/echo/v5

Technologies: [github.com/labstack/echo/v5 (Go)](https://junglewise.ai/threats/technologies/github-com-labstack-echo-v5). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is CVE-2026-25766 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-25766 being exploited in the wild.

**How severe is CVE-2026-25766?** Low severity, with a CVSS score of 3.1, published 26 February 2026.

**Which products and versions are affected?** github.com/labstack/echo/v5 (Go) SEMVER:introduced=5.0.0,fixed=5.0.3.

**Is there a fix for CVE-2026-25766?** Yes. github.com/labstack/echo/v5 (Go): upgrade to 5.0.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-25766?** Check whether you run github.com/labstack/echo/v5 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/labstack/echo/v5 (Go): upgrade to 5.0.3 or later

  ```sh
  go get github.com/labstack/echo/v5@v5.0.3
  ```


## Affected products

- github.com/labstack/echo/v5 (Go) SEMVER:introduced=5.0.0,fixed=5.0.3

## Identifiers

- CVE-2026-25766
- GHSA-pgvm-wxw2-hrv9
- GO-2026-4502

## Related threats

- [Echo web framework arbitrary URI scheme redirect](https://junglewise.ai/threats/cve-2026-118658-echo-is-a-go-web-framework-prior-to-4-15-2-and-5-1-1-context)
- [Echo Go web framework scheme header spoofing and HSTS bypass](https://junglewise.ai/threats/cve-2026-118657-echo-is-a-go-web-framework-prior-to-4-16-0-and-5-4-0-context)
- [Echo open redirect in sanitizeURI with trailing slash redirect](https://junglewise.ai/threats/cve-2026-118656-echo-is-a-go-web-framework-prior-to-4-16-0-and-5-4-0-sanitizeuri)
- [Echo path traversal via double URL encoding in Static middleware](https://junglewise.ai/threats/cve-2026-118655-echo-is-a-go-web-framework-prior-to-4-15-3-and-5-2-0-middleware)
- [Echo path traversal in static file handlers via dot segment normalization](https://junglewise.ai/threats/cve-2026-118654-echo-is-a-go-web-framework-prior-to-4-16-0-and-5-4-0-echo-s)