MediumVulnerabilityLLM-specific

CVE-2026-86289: Ollama integer overflow in GGUF decoder readGGUFV1String

Source: NVD(opens in a new tab)
Identifier: CVE-2026-86289
Published: September 7, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.7%

Summary

CVE-2026-86289 affects Ollama up to 0.31.1. An integer overflow in the readGGUFV1String function of fs/ggml/gguf.go, in the GGUF Decoder component, can be triggered remotely. A public exploit exists.

Mitigation

Upgrading to version 0.31.2-rc1 addresses this issue. The patch is named 67b6a1c2d45321e0cb3c04a18073f9818de7724b. Upgrading the affected component is recommended.

Details

Scores and exploitation

CVSS score: 4.3(medium)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Attack vector: network
Attack complexity: low
Privileges required: none
User interaction: required
EPSS: 0.7%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 4, 2026.
Disclosure date: September 7, 2026

Weaknesses and techniques

Weakness (CWE): CWE-189
CWE-190

Classification

Attack type: Other
Attack sophistication: Moderate
AI component targeted: Inference
Impact: Integrity,
Availability
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-86289

First tracked: September 7, 2026 at 08:06 AM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Topics

Inference infrastructure

Summary

Mitigation

Topics

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