CVE-2026-123158 KEV
8.1
HIGH · CVSS 3.1 · EPSS 1% (pctl 63)
Patch first
On CISA KEV — known exploited in the wild, due 2026-11-12.
Description
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.
Scoring
| CVSS | 8.1 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 1.01% — more likely to be exploited than 63% of all CVEs |
| Weakness | CWE-394 |
| On CISA KEV | yes — remediate by 2026-11-12 |
| Public exploit | none known |
| Published | 2026-11-05 |
| Last modified | 2026-11-10 |
CISA KEV
| Name | OpenBSD OpenSSH Unexpected Status Code or Return Value Vulnerability |
|---|---|
| Added | 2026-11-09 |
| Due | 2026-11-12 |
| Vendor / product | OpenBSD / OpenSSH |
| Ransomware use | none reported |
Affected (2)
| Vendor | Product |
|---|---|
| alpinelinux | alpine linux |
| openbsd | openssh |
References
- 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
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