CVE-2026-123158

Publication date 6 November 2026

Last updated 11 November 2026

Ubuntu priority

High

Why this priority?

Cvss 3 Severity Score

8.1 · High

Score breakdown

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.

Read the notes from the security team

Why is this CVE high priority?

Is in CISA KEV list

Learn more about Ubuntu priority

Status

Package Ubuntu Release Status
openssh 26.10 stonking
Not affected
26.04 LTS resolute
Not affected
24.04 LTS noble
Not affected
22.04 LTS jammy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected
openssh-ssh1 26.10 stonking Ignored
26.04 LTS resolute Ignored
24.04 LTS noble Ignored
22.04 LTS jammy Ignored
20.04 LTS focal Ignored
18.04 LTS bionic Ignored
openssh-gssapi 26.10 stonking
Not affected
26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release

Notes

mdeslaur

openssh-ssh1 is only provided for compatibility with old devices that cannot be upgraded to modern protocols. We will not be providing any security support for the openssh-ssh1 package as it is insecure and should be used in trusted environments only. In Ubuntu, we do not use musl libc by default. OpenSSH in Ubuntu is linked against glibc, and uses PAM, so it is not vulnerable to this issue.

Severity score breakdown

CVSS version: CVSS v3.0

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

References

Other references

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