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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/security/cve/CVE-2026-89091
https://bugzilla.redhat.com/show_bug.cgi?id=2531646

Configurations

No configuration.

History

08 Oct 2026, 22:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-08 22:17

Updated : 2026-10-09 16:37

NVD link : CVE-2026-89091

Mitre link : CVE-2026-89091

CVE.ORG link : CVE-2026-89091

JSON object : View

Products Affected

No product.

CWE

CWE-59

Improper Link Resolution Before File Access ('Link Following')

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"product": "Red Hat Update Infrastructure 5", "packageName": "rhui5/installer-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhui:5::el9"], "vendor": "Red Hat", "product": "Red Hat Update Infrastructure 5", "packageName": "rhui5/installer-tp-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhui:5::el9"], "vendor": "Red Hat", "product": "Red Hat Update Infrastructure 5", "packageName": "rhui5/rhua-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:rhui:5::el9"], "vendor": "Red Hat", "product": "Red Hat Update Infrastructure 5", "packageName": "rhui5/rhua-tp-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}, {"cpes": ["cpe:/a:redhat:ansible_portal:2"], "vendor": "Red Hat", "product": "Self-service automation portal 2", "packageName": "ansible-automation-platform/bootc-automation-portal-rhel9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "affected"}]}], "published": "2026-10-08T22:17:35.777", "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-89091", "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531646", "source": "secalert@redhat.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-59"}]}], "descriptions": [{"lang": "en", "value": "A flaw was found in ansible-core. When installing a collection with\n`ansible-galaxy collection install`, the archive extractor validates member\npaths using lexical path normalisation (os.path.abspath) instead of resolving\nsymbolic links (os.path.realpath), and it performs no containment check on\nsymlink-typed directory members before creating them. A crafted collection\ntarball can chain symlink directory entries so that a subsequent file member is\nwritten outside the intended destination directory. This allows an attacker who\ncan get a victim to install a malicious collection to overwrite arbitrary files\nwith the privileges of the user running ansible-galaxy, leading to code\nexecution on the control node. This is a bypass of the fix for CVE-2020-10691."}], "lastModified": "2026-10-09T16:37:45.710", "sourceIdentifier": "secalert@redhat.com"}