GO-2026-6909

    Dashboard / Vulnerabilities / GO-2026-6909

    GO-2026-6909

    Published: 5 Nov 2026Last Modified: 5 Nov 2026

    Summary: Nil-pointer panic in validateAssertion and namespace-blind Subject.NameID in github.com/crewjam/saml

    Details: github.com/crewjam/saml through v0.5.1 contains two vulnerabilities in SAML assertion processing: 1. ServiceProvider.validateAssertion dereferences assertion.Issuer without a nil check when ExpectedIDPEntityID is non-empty. A signed SAML assertion that omits the optional <saml:Issuer> element causes a nil-pointer dereference panic after signature verification. 2. Subject uses the bare XML struct tag xml:"NameID", which matches <NameID> elements in any XML namespace. When a signed assertion omits <saml:NameID> and includes a <NameID> element in a foreign namespace inside <saml:Subject>, encoding/xml populates Subject.NameID from the foreign element, allowing an authenticated principal to spoof Subject.NameID.Value.

    References: https://github.com/golang/vulndb/issues/6909

    Affected packages

    Package

    Name: github.com/crewjam/saml

    Purl: pkg:golang/github.com/crewjam/saml

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    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
    GO-2026-6909 | CVE-DB