CVE-2026-11837

Description

A local privilege escalation vulnerability was found in the ansible.posix authorized_key module. The module's keyfile() function uses os.chown() instead of os.lchown() and opens files without O_NOFOLLOW when managing SSH authorized keys. An unprivileged local user can pre-stage symbolic links in their ~/.ssh directory to redirect file ownership changes to arbitrary system paths when an operator runs the authorized_key task as root, leading to local privilege escalation.

CVSS v3.1 Score

7.3

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-59 CWE-59

References

Other References

https://access.redhat.com/security/cve/CVE-2026-11837 https://bugzilla.redhat.com/show_bug.cgi?id=2487424

Frequently Asked Questions

What is CVE-2026-11837? +

A local privilege escalation vulnerability was found in the ansible.posix authorized_key module. The module's keyfile() function uses os.chown() instead of os.lchown() and opens files without O_NOFOLLOW when managing SSH authorized keys. An unprivileged local user can pre-stage symbolic links in their ~/.ssh directory to redirect file ownership changes to arbitrary system paths when an operator runs the authorized_key task as root, leading to local privilege escalation. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-11837? +

CVE-2026-11837 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-11837? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-30371

Metabase is a business intelligence and embedded analytics tool. Versions prior to v0.52.16.4, v1.52.16.4, v0.53.8, and v1.53.8 are vulnerable to …

CVE-2025-4211

Improper Link Resolution Before File Access ('Link Following') vulnerability in QFileSystemEngine in the Qt corelib module on Windows which potentially …

CVE-2025-2102

Improper Link Resolution Before File Access ('Link Following') vulnerability in HYPR Passwordless on Windows allows Privilege Escalation.This issue affects HYPR …

CVE-2025-52936

Improper Link Resolution Before File Access ('Link Following') vulnerability in yrutschle sslh.This issue affects sslh: before 2.2.2.

CVE-2025-53109

Model Context Protocol Servers is a collection of reference implementations for the model context protocol (MCP). Versions of Filesystem prior …

CVE-2025-7012

An issue in Cato Networks' CatoClient for Linux, before version 5.5, allows a local attacker to escalate privileges to root …