CVE-2026-118656

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    CVE-2026-118656

    Published: 28 Oct 2026Last Modified: 5 Nov 2026

    Summary: Echo: Open Redirect via Control-Character Prefix Defeating sanitizeURI

    Details: Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, sanitizeURI checks only the first two bytes of a redirect target before deciding whether it begins with an absolute-path separator pair. When AddTrailingSlash or RemoveTrailingSlash is configured with a redirect status, a slash, TAB, separator path form can evade the guard, be emitted in the Location header, and be normalized by a browser into an attacker-controlled host. This issue is fixed in 4.16.0 and 5.4.0.

    References: https://github.com/labstack/echo/releases/tag/v4.16.0, https://github.com/labstack/echo/releases/tag/v5.4.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118656.json, https://github.com/labstack/echo/security/advisories/GHSA-v753-g4cw-jm48, https://nvd.nist.gov/vuln/detail/CVE-2026-118656, https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1, https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 9500f2745481e2dff1313e2e6734c488e80c13fb
    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-2026-118656 | CVE-DB