Vulnerability details
CVE-2026-123158
Actively exploited
OpenBSD OpenSSH
CVSS 3.1
8.1High
Official 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.
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CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (mitre) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| OpenBSD | OpenSSH | v < 10.6p2 | CVEProject cvelistV5 (CNA) |
References and advisories
18- https://www.openssh.org/releasenotes.html#10.6p2
- https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482
- https://news.ycombinator.com/item?id=50377976
- https://news.ycombinator.com/item?id=50378228
- https://marc.info/?l=openssh-unix-dev&m=179388064263131&w=2
- https://hachyderm.io/@damienmiller/117563026759098135
- https://github.com/predkambrij/sshhole-repro
- https://github.com/leonjza/sshhole-lab
- https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/
- https://news.ycombinator.com/item?id=50379704
- https://github.com/google/goonami-scanner/pull/277
- https://github.com/coollabsio/coolify/discussions/12484
- https://github.com/panubo/docker-sshd/issues/93
- http://www.openwall.com/lists/oss-security/2026/11/09/27
- https://sshhole.com exploittechnical-description
- https://sshole.events.greynoise.io/ third-party-advisory
- https://isc.sans.edu/diary.html?storyid=33498 third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-123158 government-resource
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Details
- Published
- 2026-11-05
- Last updated
- 2026-11-10
- State
- Published
- Assigner (CNA)
- mitre
- Kolun priority
- 88 · Critical
CISA KEV catalog
- Date added
- 2026-11-09
- Due date
- 2026-11-12
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
1.01%
Probability of exploitation in 30 days
63.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-394Unexpected Status Code or Return Value