An issue in ollama v.0.12.10 allows a remote attacker to cause a denial of service via the GGUF decoder

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00105.

Exploitation poc

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Ollama Subscribe
Ollama Subscribe

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Ollama Subscribe
Ollama Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/ollama/ollama/issues/9820 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-66959 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-66959 cve-icon
https://zero.shotlearni.ng/blog/cve-2025-66959panic-dos-via-unchecked-length-in-gguf-decoder-copy/ cve-icon cve-icon cve-icon
History

Fri, 23 Jan 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Ollama
Ollama ollama
Vendors & Products Ollama
Ollama ollama

Fri, 23 Jan 2026 00:15:00 +0000

Type Values Removed Values Added
Title ollama: ollama: Denial of Service via GGUF decoder
Weaknesses CWE-130
References
Metrics threat_severity

None

 threat_severity

Moderate

Thu, 22 Jan 2026 15:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-400
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 21 Jan 2026 17:45:00 +0000

Type Values Removed Values Added
Description An issue in ollama v.0.12.10 allows a remote attacker to cause a denial of service via the GGUF decoder
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-01-22T14:41:22.418Z

Reserved: 2025-12-08T00:00:00.000Z

Link: CVE-2025-66959

cve-icon Vulnrichment

Updated: 2026-01-22T14:40:50.280Z

cve-icon NVD

Status : Received

Published: 2026-01-21T18:16:23.470

Modified: 2026-01-22T15:16:48.550

Link: CVE-2025-66959

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-01-21T00:00:00Z

Links: CVE-2025-66959 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-01-22T10:15:04Z

Weaknesses