CVE-2026-118651

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    CVE-2026-118651

    Published: 28 Oct 2026Last Modified: 5 Nov 2026

    Summary: Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default

    Details: Echo is a Go web framework. From 4.0.0 until 5.4.0, the Proxy middleware can preserve an attacker-supplied X-Real-IP header and forward it to an upstream service when Echo.IPExtractor is not configured. A remote client can therefore make upstream services receive a spoofed client address, undermining IP-based access controls, rate limiting, audit logging, or geographic restrictions that trust Echo's forwarded identity. This issue is fixed in Echo 5.4.0.

    References: https://github.com/labstack/echo/releases/tag/v5.4.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118651.json, https://github.com/labstack/echo/security/advisories/GHSA-99jh-6h7p-pp36, https://nvd.nist.gov/vuln/detail/CVE-2026-118651, https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 6d9e043284aea2d07f5fcaf0d3a424eb7d9f6109
    Fixed -fc410094b2f3415cf2bf5204082137b205bfd5af

    Affected versions

    v5.3.1
    v5.3.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-118651 | CVE-DB