GO-2025-3955

    Dashboard / Vulnerabilities / GO-2025-3955

    GO-2025-3955

    Published: 22 Sept 2025Last Modified: 15 May 2026

    Summary: CrossOriginProtection insecure bypass patterns not limited to exact matches in net/http

    Details: When using http.CrossOriginProtection, the AddInsecureBypassPattern method can unexpectedly bypass more requests than intended. CrossOriginProtection then skips validation, but forwards the original request path, which may be served by a different handler without the intended security protections.

    References: https://go.dev/cl/699275, https://go.dev/issue/75054, https://groups.google.com/g/golang-announce/c/PtW9VW21NPs/m/DJhMQ-m5AQAJ

    Affected packages

    Package

    Name: stdlib

    Purl: pkg:golang/stdlib

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 1.25.0
    Fixed -1.25.1

    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