# 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.

CVE-2026-123158 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-123158, released November 9, 2026. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on November 9, 2026. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/cve/CVE-2026-123158
- Priority: Patch now
- CVSS: 8.1 (Important)
- EPSS: 0.1650
- CISA KEV: listed Nov 9, 2026, federal due date Nov 12, 2026
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 5, 2026
- Weakness: Unexpected Status Code or Return Value
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-123158

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | openssh Debian 14 | 1:10.6p2-1 | [DEBIAN-CVE-2026-123158](https://patchblox.com/security/data/fix/linux/debian-cve-2026-123158.md) | Nov 9, 2026 |
| Linux | openssh-gssapi Debian 14 | 1:10.6p2-1 | [DEBIAN-CVE-2026-123158](https://patchblox.com/security/data/fix/linux/debian-cve-2026-123158.md) | Nov 9, 2026 |

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Data as of 2026-11-11T01:43:54Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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