Skip to content
OpenAdvisories
High · 8.1 Known exploited Public exploit CVE-2026-123158 EUVD-2026-117552GHSA-4fcc-vm97-gx3x

sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (relate…

Published Nov 5, 2026 · Updated Nov 10, 2026 · Assigned by mitre

Vendor: OpenBSD Product: OpenSSH Package: openssh Package: openssh Package: openssh Package: openssh Package: openssh-gssapi Package: openssh-gssapi Package: openssh-ssh1 Ecosystem: Alpine Ecosystem: Azure Linux Ecosystem: Debian Ecosystem: Ubuntu

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.

Affected products

VendorProductAffectedFixed
OpenBSD OpenSSH < 10.6p2 10.6p2

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗
ReleasePackageFixed inAdvisory
Debian 14 openssh +1 1:10.6p2-1 —
Debian 13 openssh No fix yet —
Debian 12 openssh No fix yet —

Ubuntu

Security tracker ↗
ReleasePackageFixed inAdvisory
Ubuntu 26.10 openssh-ssh1 No fix yet —
Ubuntu 26.04 LTS openssh-ssh1 No fix yet —
Ubuntu 24.04 LTS openssh-ssh1 No fix yet —
Ubuntu 22.04 LTS openssh-ssh1 No fix yet —
Ubuntu 20.04 LTS openssh-ssh1 No fix yet —
Show 1 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 18.04 LTS openssh-ssh1 No fix yet —

Alpine

Security tracker ↗
ReleasePackageFixed inAdvisory
Alpine v3.24 openssh 10.3_p1-r2 —
Alpine v3.23 openssh 10.2_p1-r1 —
Alpine v3.22 openssh 10.0_p1-r11 —
Alpine v3.21 openssh 9.9_p2-r1 —
Alpine v3.20 openssh 9.7_p1-r6 —
Show 4 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Alpine v3.19 openssh 9.6_p1-r3 —
Alpine v3.18 openssh 9.3_p2-r4 —
Alpine v3.17 openssh 9.1_p1-r7 —
Alpine v3.16 openssh 9.0_p1-r6 —

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 openssh No fix yet —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 38 repositories · most starred shown

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 2

References