GO-2026-5856

    Dashboard / Vulnerabilities / GO-2026-5856

    GO-2026-5856

    Published: 7 Jul 2026Last Modified: 31 Jul 2026

    Summary: Invoking Encrypted Client Hello privacy leak in crypto/tls

    Details: Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.

    References: https://go.dev/cl/775960, https://go.dev/issue/79282, https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc

    Affected packages

    Package

    Name: stdlib

    Purl: pkg:golang/stdlib

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -1.25.12

    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-2026-5856 | CVE-DB