Labstack Echo up to 5.4.0 BodyDump Middleware input validation

Summaryinfo

A vulnerability, which was classified as critical, was found in Labstack Echo up to 5.4.0. Affected by this vulnerability is an unknown functionality of the component BodyDump Middleware. Executing a manipulation can lead to input validation. The identification of this vulnerability is CVE-2026-118263. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Labstack Echo up to 5.4.0. It has been declared as critical. This vulnerability affects some unknown functionality of the component BodyDump Middleware. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Echo is a Go web framework. From 5.0.0 until 5.4.1, Echo v5's BodyDump middleware can discard a BodyLimit overflow error for an unknown-length request when BodyDump's capture limit is below the BodyLimit threshold. BodyDump drains the remaining body while ignoring read errors and replaces it with the captured prefix, so an HTTP/1.1 chunked request can be truncated and processed successfully even though the original body exceeded the configured limit. Known-length requests rejected before BodyDump runs are unaffected, and the issue does not establish a general authentication bypass or denial of service. This issue is fixed in 5.4.1.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-118263 since 10/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 5.4.1 eliminates this vulnerability.

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Productinfo

Vendor

• Labstack

Name

• Echo

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4.0

Website

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

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