CVE-2026-126644 - Ansible.posix: authorized_key module follows a parent-directory symlink allowing writes outside the intended directory

CVE-2026-126644 - Ansible.posix: authorized_key module follows a parent-directory symlink allowing writes outside the intended directory

https://cvefeed.io/rssfeed/latest.atom / Thu, 11/12/2026 - 14:08
CVE ID :CVE-2026-126644
Published : Nov. 12, 2026, 11:17 a.m. | 1 hour, 42 minutes ago
Description :A link-following flaw was found in the authorized_key module of the ansible.posix collection, residual to the fix for CVE-2026-11837. That fix guards only the final path component (os.chown with follow_symlinks=False and O_NOFOLLOW in _safe_open_write()). When an unprivileged local user replaces their ~/.ssh directory with a symlink to a directory they do not own, and an operator subsequently runs the authorized_key task as root (a common provisioning pattern), the module resolves its path operations through the symlink: atomic_move() writes the temporary file in the symlink target and renames it to /authorized_keys, creating or overwriting a file in the attacker-chosen directory, and os.chmod(sshdir, 0o700) follows the symlink and changes the target directory's permissions. The written file is chowned to the unprivileged user, so this is not a privilege escalation, but it allows an attacker to create or overwrite files (for example in /etc/apt/apt.conf.d/, which APT reads regardless of file ownership) to cause integrity and availability impacts.
Severity: 3.9 | LOW
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