GO-2026-5020

    Dashboard / Vulnerabilities / GO-2026-5020

    GO-2026-5020

    Published: 22 May 2026Last Modified: 25 Jun 2026

    Summary: Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh

    Details: When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.

    References: https://go.dev/issue/79567, https://groups.google.com/g/golang-announce/c/a082jnz-LvI, https://go.dev/cl/781663

    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