CVE-2026-118681

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    CVE-2026-118681

    Published: 28 Oct 2026Last Modified: 5 Nov 2026

    Summary: go-chi chi before 5.5.0 Authentication Bypass via SupressNotFound Middleware

    Details: go-chi chi before 5.5.0 contains an authentication bypass in middleware.SupressNotFound, which calls Match with the live routing context and leaves a mounted router's parameter and child suffix in place for dispatch against the outer router. Unauthenticated attackers can request a mounted path whose suffix matches an outer public route, skipping the mounted authentication middleware and retrieving tenant-scoped data when that outer handler trusts the retained mount parameter.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118681.json, https://github.com/go-chi/chi/security/advisories/GHSA-rqrp-8cg2-5958, https://nvd.nist.gov/vuln/detail/CVE-2026-118681, https://www.vulncheck.com/advisories/go-chi-chi-before-5.5.0-authentication-bypass-via-supressnotfound-middleware

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -3a33ba578e0dd93444e0ff386cc26e665d92e31e

    Affected versions

    v5.4.0

    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-2026-118681 | CVE-DB