GO-2026-5038

    Dashboard / Vulnerabilities / GO-2026-5038

    GO-2026-5038

    Published: 2 Jun 2026Last Modified: 10 Sept 2026

    Summary: Quadratic complexity in WordDecoder.DecodeHeader in mime

    Details: Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.

    References: https://go.dev/issue/79217, https://go.dev/cl/774481, https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw

    Affected packages

    Package

    Name: stdlib

    Purl: pkg:golang/stdlib

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -1.25.11

    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-2026-5038 | CVE-DB