GO-2026-5006

    Dashboard / Vulnerabilities / GO-2026-5006

    GO-2026-5006

    Published: 22 May 2026Last Modified: 11 Aug 2026

    Summary: Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent

    Details: When adding a key to a remote agent constraint extensions such as [email protected] were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.

    References: https://go.dev/issue/79435, https://go.dev/cl/778640, https://go.dev/cl/778641, https://groups.google.com/g/golang-announce/c/a082jnz-LvI

    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