Vulnerability in OpenBSD OpenSSH
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/leonjza/sshhole-lab
- github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf…
- github.com/predkambrij/sshhole-repro
- hachyderm.io/@damienmiller/117563026759098135
- marc.info/
- news.ycombinator.com/item
- news.ycombinator.com/item
- www.openssh.org/releasenotes.html
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2026-123158?
- CVE-2026-123158 is a high-severity vulnerability in OpenBSD OpenSSH, classified under CWE-394. CVSS score: 8.1/10. Published 2026-11-05.
- How severe is CVE-2026-123158?
- High severity. CVSS v3 base score is 8.1 out of 10.