CVE-2026-123158
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
Added: 2026-11-09 · Due: 2026-11-12
Known ransomware use: Unknown
As of 2026-11-09
EPSS estimates exploitation probability over the next 30 days. KEV due dates apply to US federal civilian agencies. Confirm your affected versions in vendor advisories.
CWE: CWE-394 · Published: 2026-11-05T16:17:47.110 · Modified: 2026-11-10T01:17:16.970
Sources: NIST NVD, CISA KEV, FIRST EPSS. NVD and EPSS cached up to 6 hours; KEV up to 12 hours.
References and fixes
- https://github.com/leonjza/sshhole-lab
- https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482
- https://github.com/predkambrij/sshhole-repro
- 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://www.openssh.org/releasenotes.html#10.6p2
- http://www.openwall.com/lists/oss-security/2026/11/09/27
- https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/
- https://github.com/coollabsio/coolify/discussions/12484
- https://github.com/google/goonami-scanner/pull/277
- https://github.com/panubo/docker-sshd/issues/93
- https://news.ycombinator.com/item?id=50379704
- https://isc.sans.edu/diary.html?storyid=33498
- https://sshhole.com
- https://sshole.events.greynoise.io/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-123158