CVE-2026-123158
CVE-2026-123158
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| OpenSSH OpenBSD Platforms: Linux |
≥ 0; < 10.6p2 (affected, custom)
Other versions: unaffected |
CNA: mitre |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 8.1 high |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | CNA: mitre |
| 3.1 / 8.1 high |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD: [email protected] |
Exploit evidence
- https://sshhole.com/
exploit · ADP: CISA-ADP
References
- https://www.openssh.org/releasenotes.html#10.6p2CNA: mitre
- https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482CNA: mitre
- https://news.ycombinator.com/item?id=50377976CNA: mitre
- https://news.ycombinator.com/item?id=50378228CNA: mitre
- https://marc.info/?l=openssh-unix-dev&m=179388064263131&w=2CNA: mitre
- https://hachyderm.io/@damienmiller/117563026759098135CNA: mitre
- https://github.com/predkambrij/sshhole-reproCNA: mitre
- https://github.com/leonjza/sshhole-labCNA: mitre
- https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/ADP: CVE
- https://news.ycombinator.com/item?id=50379704ADP: CVE
- https://github.com/google/goonami-scanner/pull/277ADP: CVE
- https://sshhole.com/ADP: CISA-ADP · exploit
- https://github.com/leonjza/sshhole-lab[email protected]
- https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482[email protected]
- https://github.com/predkambrij/sshhole-repro[email protected]
- https://hachyderm.io/@damienmiller/117563026759098135[email protected]
- https://marc.info/?l=openssh-unix-dev&m=179388064263131&w=2[email protected]
- https://news.ycombinator.com/item?id=50377976[email protected]
- https://news.ycombinator.com/item?id=50378228[email protected]
- https://www.openssh.org/releasenotes.html#10.6p2[email protected]
- https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/af854a3a-2127-422b-91ae-364da2661108
- https://github.com/google/goonami-scanner/pull/277af854a3a-2127-422b-91ae-364da2661108
- https://news.ycombinator.com/item?id=50379704af854a3a-2127-422b-91ae-364da2661108
- https://sshhole.com/134c704f-9b21-4f2e-91b3-4a467353bcc0
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