Vulnerability in Red Hat Advanced Cluster Management For Kubernetes 2
CVE-2026-89091
A flaw was found in ansible-core. When installing a collection with `ansible-galaxy collection install`, the archive extractor validates member paths using lexical path normalisation (os.path.abspath) instead of resolving symbolic links (os.path.realpath), and it performs no containment check on symlink-typed directory members before creating them. A crafted collection tarball can chain symlink directory entries so that a subsequent file member is written outside the intended destination directory. This allows an attacker who can get a victim to install a malicious collection to overwrite arbitrary files with the privileges of the user running ansible-galaxy, leading to code execution on the control node. This is a bypass of the fix for CVE-2020-10691.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Red Hat Advanced Cluster Management For Kubernetes 2
- Red Hat Ansible Automation Platform 2
- Red Hat Ansible Automation Platform Core 2
- Red Hat Discovery 2
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Openshift Container Platform 4
- Red Hat OpenStack Platform 17.1
- Red Hat Satellite 6
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-89091 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
Frequently asked questions
- What is CVE-2026-89091?
- CVE-2026-89091 is a high-severity vulnerability in Red Hat Advanced Cluster Management For Kubernetes 2, classified under Improper Link Resolution Before File Access. CVSS score: 8.8/10. Published 2026-10-08.
- How severe is CVE-2026-89091?
- High severity. CVSS v3 base score is 8.8 out of 10.