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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...

HighCVSS 8.1 EPSS 16.5% CISA KEV added 2026-11-09 · due 2026-11-12 Exploited in the wild
Published
Updated
Exploit status
Exploited in the wild (confirmed)
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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.

CISA Known Exploited Vulnerability

Date added
2026-11-09
Due date (FCEB)
2026-11-12
Ransomware use
Unknown

Required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Affected products

ProductAffected versionsFixed in
azure linux openssh(Azure Linux:3.0) All versions No fix listed
debian/openssh(Debian:12) All versions No fix listed
debian/openssh(Debian:14) < 1:10.6p2-1 1:10.6p2-1
debian/openssh(Debian:13) All versions No fix listed
debian/openssh-gssapi(Debian:14) < 1:10.6p2-1 1:10.6p2-1
OpenBSD openssh < 10.6p2 10.6p2

References