Labstack Echo up to 5.4.0 IP Extraction ExtractIPFromRealIPHeader X-Real-IP improper authentication

Summaryinfo

A vulnerability was found in Labstack Echo up to 5.4.0. It has been declared as problematic. This issue affects the function ExtractIPFromRealIPHeader of the component IP Extraction. Such manipulation of the argument X-Real-IP leads to improper authentication. This vulnerability is listed as CVE-2026-118265. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Labstack Echo up to 5.4.0. Affected by this issue is the function ExtractIPFromRealIPHeader of the component IP Extraction. The manipulation of the argument X-Real-IP with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is integrity. CVE summarizes:

Echo is a Go web framework. From 5.0.0 until 5.4.1, Echo v5's ExtractIPFromRealIPHeader validates whether the client-supplied X-Real-IP value belongs to a trusted range instead of validating the direct network peer. A client reaching Echo directly, or through a proxy that preserves the header, can supply a loopback or private address and have Context.RealIP return that spoofed identity. Applications using the extractor for IP allowlists, rate limiting, audit logs, or forwarding headers can consequently trust an attacker-controlled address; the default direct extractor and Echo v4 are unaffected. This issue is fixed in 5.4.1.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-118265 since 10/27/2026. 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.

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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