CVE-2026-123158

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    CVE-2026-123158

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

    Summary:

    Details: sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.

    References: https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/, https://hachyderm.io/@damienmiller/117563026759098135, https://marc.info/?l=openssh-unix-dev&m=179388064263131&w=2, https://news.ycombinator.com/item?id=50377976, https://news.ycombinator.com/item?id=50378228, https://news.ycombinator.com/item?id=50379704, https://www.openssh.org/releasenotes.html#10.6p2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/123xxx/CVE-2026-123158.json, https://nvd.nist.gov/vuln/detail/CVE-2026-123158, https://github.com/google/goonami-scanner/pull/277, https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482, https://github.com/leonjza/sshhole-lab, https://github.com/predkambrij/sshhole-repro, https://sshhole.com

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -4353fdc43ef646c43a8dda7025cc1a898caf1482

    Affected versions

    V_9_5_P1

    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
    CVE-2026-123158 | CVE-DB