CVE-2026-89091

Status: Awaiting AnalysisHigh (8.8)—
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

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Base score: 8.8
Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.48%
Percentile among all scored CVEs: 40
Score date: 10/14/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.
ExploitationT1203 Exploitation for Client Executionexecution90 %
Primary impactT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Secondary impactT1059 Command and Scripting Interpreterexecution80 %
Vector CVSS con UI:R (interacción del usuario) requiere que la víctima instale una colección maliciosa. El archivo crafted permite sobrescribir archivos arbitrarios con privilegios del usuario (escalada), desencadenando ejecución de código en el nodo de control.
Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.
🛡️ ATT&CK mitigations that cover these techniques

Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software Threat Intelligence Program Restrict Web-Based Content
Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
Ansible — Ansible-core^AI
CWEs

CWE-59
References

Raw JSON (NVD)

Show
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  ],
  "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"
}