UBUNTU-CVE-2026-123158
Dashboard / Vulnerabilities / UBUNTU-CVE-2026-123158
Summary:
Details: 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.
References: https://ubuntu.com/security/CVE-2026-123158, https://www.cve.org/CVERecord?id=CVE-2026-123158, https://hachyderm.io/@damienmiller/117563026759098135, https://www.openwall.com/lists/oss-security/2026/11/05/3, https://github.com/leonjza/sshhole-lab, https://github.com/openssh/openssh-portable/commit/4353fdc43ef646c43a8dda7025cc1a898caf1482, https://github.com/predkambrij/sshhole-repro, https://marc.info/?l=openssh-unix-dev&m=179388064263131&w=2, https://news.ycombinator.com/item?id=50377976, https://news.ycombinator.com/item?id=50378228, https://www.openssh.org/releasenotes.html#10.6p2, https://alpinelinux.org/posts/2026-11-05-openssh-password-authentication-bypass/, https://github.com/google/goonami-scanner/pull/277, https://news.ycombinator.com/item?id=50379704, https://sshhole.com
Affected packages
Package
Name: openssh
Purl: pkg:deb/ubuntu/openssh?arch=source&distro=esm-infra-legacy%2Ftrusty
Affected ranges
Type: ECOSYSTEM
Events:
