CVE-2025-66959: PYSEC-2026-101 - An issue in ollama v.0.12.10 allows a remote attacker to cause a denial of service via the GGUF decoder

CVE-2025-66959 · Severity: low · CVSS 3.1 · Published 2026-01-21

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

Technologies: ollama (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2025-66959 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-66959 being exploited in the wild.
How severe is CVE-2025-66959?
Low severity, with a CVSS score of 3.1, published 21 January 2026.
Which products and versions are affected?
ollama (PyPI) ECOSYSTEM:introduced=0,last_affected=0.12.10-NA.
Is there a fix for CVE-2025-66959?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2025-66959?
Check whether you run ollama (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • ollama (PyPI) ECOSYSTEM:introduced=0,last_affected=0.12.10-NA

Identifiers

  • CVE-2025-66959
  • PYSEC-2026-101

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.