CVE-2025-66960Public exploitNetwork attack vector

Unauthenticated service crash via unchecked string length

Published Jan 21, 2026 · Updated Jan 21, 2026

Improper input validation in Ollama 0.12.10 and earlier allows remote attackers to crash the server with a crafted GGUF v1 model. readGGUFV1String in fs/ggml/gguf.go passes an attacker-controlled metadata length to bytes.Buffer.Truncate without validating its bounds, triggering a panic. Unauthenticated access to /api/blobs and /api/create is sufficient, and successful exploitation terminates the Ollama process.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Ollama 0.12.10 and earlier allows remote attackers to crash the server with a crafted GGUF v1 model. readGGUFV1String in fs/ggml/gguf.go passes an attacker-controlled metadata length to bytes.Buffer.Truncate without validating its bounds, triggering a panic. Unauthenticated access to /api/blobs and /api/create is sufficient, and successful exploitation terminates the Ollama process.

The record

CVE
CVE-2025-66960
Published
Jan 21, 2026
Updated
Jan 21, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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