CVE-2026-123158
High8.1sshd 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.
- CVSS
- 8.1v3.1
- EPSS (exploit probability)
- 1.0%62th pct
- CISA KEV
- Not listed
EPSS trendFIRST daily scores, last 90 days
Daily values
| Score date | EPSS | Percentile |
|---|---|---|
| 2026-11-06 | 1.0% | 62.3% |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Learn
Why it happened and what stops it
The weakness (CWE)
Coverage2 articles
SANS Stormcast Friday, November 6th, 2026: RootEvidence Cisco IOS Opt-Out Scans; OpenSSH musl sshhole (CVE-2026-123158); Refrigeration OT Hardening; Zyxel GS1900 OOB Write (CVE-2026-107441)
Podcast8 minSANS Internet Storm Center StormCast14h agoVulnerabilitiesIdentityEndpointCVE-2026-107441CVE-2026-123158
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
- https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/
- https://github.com/google/goonami-scanner/pull/277
- https://news.ycombinator.com/item?id=50379704
- https://sshhole.com