labstack echo up to 4.15.2/5.1.x path traversal

Summaryinfo

A vulnerability classified as critical has been found in labstack echo up to 4.15.2/5.1.x. Affected is an unknown function. The manipulation leads to path traversal. This vulnerability is traded as CVE-2026-55677. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in labstack echo up to 4.15.2/5.1.x. It has been rated as critical. This issue affects some unknown processing. 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. The summary by CVE is:

Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, Echo's router and static file handler disagree on URL path decoding. The router matches routes using the raw encoded path (preserving %2F as-is), while StaticDirectoryHandler unescapes %2F to / before resolving filesystem paths. This allows an attacker to bypass route-level access controls and read static files without authorization. This vulnerability is fixed in 4.15.3 and 5.2.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-55677 since 06/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

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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