GO-2026-5019

    Dashboard / Vulnerabilities / GO-2026-5019

    GO-2026-5019

    Published: 22 May 2026Last Modified: 17 Sept 2026

    Summary: Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh

    Details: The Verify() method for FIDO/U2F security key types ([email protected], [email protected]) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a "no-touch-required" extension in Permissions.Extensions from PublicKeyCallback.

    References: https://go.dev/issue/79566, https://groups.google.com/g/golang-announce/c/a082jnz-LvI, https://go.dev/cl/781662

    Affected packages

    Package

    Name: golang.org/x/crypto

    Purl: pkg:golang/golang.org/x/crypto

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -0.52.0

    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