GO-2026-6089

    Dashboard / Vulnerabilities / GO-2026-6089

    GO-2026-6089

    Published: 13 Aug 2026Last Modified: 11 Sept 2026

    Summary: Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http

    Details: When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.

    References: https://go.dev/issue/80205, https://go.dev/cl/795540, https://groups.google.com/g/golang-announce/c/94pEornpRlI

    Affected packages

    Package

    Name: stdlib

    Purl: pkg:golang/stdlib

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -1.25.13

    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