CVE-2026-123158

High8.1 Published on Nov 5, 2026

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.

Actively exploited

In the CISA exploited-vulnerabilities catalogue since Nov 9, 2026
US federal agencies must remediate it by Nov 12, 2026 (BOD 22-01)
Attacked on the day of disclosure
Confirmed by sensors, not only by reports

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.

Source: CISA KEV · Nov 9, 2026 Nov 7, 2026 Nov 7, 2026 Nov 6, 2026 Nov 6, 2026

CVSS score8.1 / 10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness type (CWE)CWE-394

Vendorsopenbsd, alpinelinux