Labstack Echo up to 4.15.2/5.1.x Static Middleware middleware.Static path traversal

Summaryinfo

A vulnerability classified as problematic was found in Labstack Echo up to 4.15.2/5.1.x. The impacted element is the function middleware.Static of the component Static Middleware. Such manipulation leads to path traversal. This vulnerability is traded as CVE-2026-118655. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Labstack Echo up to 4.15.2/5.1.x. Affected by this issue is the function middleware.Static of the component Static Middleware. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. CVE summarizes:

Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-118655 since 10/28/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 4.15.3 or 5.2.0 eliminates this vulnerability.

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Productinfo

Vendor

• Labstack

Name

• Echo

Version

• 4.15.0
• 4.15.1
• 4.15.2
• 5.0
• 5.1

Website

• Product: https://github.com/labstack/echo/

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