# CVE-2026-123158: CVE-2026-123158

Status: published. Published: 2026-11-05. Updated: 2026-11-06.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- OpenBSD / OpenSSH: ≥ 0; < 10.6p2 (affected, custom). Source: CNA: mitre; platforms: Linux

## Severity and prioritization

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: mitre

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: cve@mitre.org

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation poc; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-394

## Exploit evidence

- exploit: https://sshhole.com/ (ADP: CISA-ADP)

## References

- https://www.openssh.org/releasenotes.html#10.6p2 (CNA: mitre)

- https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482 (CNA: mitre)

- https://news.ycombinator.com/item?id=50377976 (CNA: mitre)

- https://news.ycombinator.com/item?id=50378228 (CNA: mitre)

- https://marc.info/?l=openssh-unix-dev&m=179388064263131&w=2 (CNA: mitre)

- https://hachyderm.io/@damienmiller/117563026759098135 (CNA: mitre)

- https://github.com/predkambrij/sshhole-repro (CNA: mitre)

- https://github.com/leonjza/sshhole-lab (CNA: mitre)

- https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/ (ADP: CVE)

- https://news.ycombinator.com/item?id=50379704 (ADP: CVE)

- https://github.com/google/goonami-scanner/pull/277 (ADP: CVE)

- https://sshhole.com/ (ADP: CISA-ADP; exploit)

- https://github.com/leonjza/sshhole-lab (cve@mitre.org)

- https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482 (cve@mitre.org)

- https://github.com/predkambrij/sshhole-repro (cve@mitre.org)

- https://hachyderm.io/@damienmiller/117563026759098135 (cve@mitre.org)

- https://marc.info/?l=openssh-unix-dev&m=179388064263131&w=2 (cve@mitre.org)

- https://news.ycombinator.com/item?id=50377976 (cve@mitre.org)

- https://news.ycombinator.com/item?id=50378228 (cve@mitre.org)

- https://www.openssh.org/releasenotes.html#10.6p2 (cve@mitre.org)

- https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/ (af854a3a-2127-422b-91ae-364da2661108)

- https://github.com/google/goonami-scanner/pull/277 (af854a3a-2127-422b-91ae-364da2661108)

- https://news.ycombinator.com/item?id=50379704 (af854a3a-2127-422b-91ae-364da2661108)

- https://sshhole.com/ (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: mitre: https://www.cve.org/CVERecord?id=CVE-2026-123158; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123158; retrieved 2026-11-06; source updated 2026-11-06

Revision: ab2c1f0520208a3185024e3a23de5d1186d82b1b8e531f9d07033795b84b4331

Canonical: https://y2.dev/cve/CVE-2026-123158

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