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CVE-2026-86289

Ollama GGUF Decoder gguf.go readGGUFV1String integer overflow

MEDIUM
4.3
CVSS Score
Published: September 7, 2026 at 08:45 AM UTC
Updated: September 11, 2026 at 09:17 PM UTC
1 product affected across 1 vendorOllama

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.7%
SSVC
PoC

Description

A vulnerability was found in Ollama up to 0.31.1. This issue affects the function readGGUFV1String of the file fs/ggml/gguf.go of the component GGUF Decoder. Performing a manipulation results in integer overflow. The attack is possible to be carried out remotely. The exploit has been made public and could be used. Upgrading to version 0.31.2-rc1 is capable of addressing this issue. The patch is named 67b6a1c2d45321e0cb3c04a18073f9818de7724b. It is recommended to upgrade the affected component.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ollama· Ollama
60%
0.31.00.31.1
Vendor states this is fixed in 0.31.2-rc1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (9)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/vuln/399448
SignaturePermissions Required
Source: cverecord
https://vuldb.com/vuln/399448/cti
Third Party Advisory
Source: cverecord
https://vuldb.com/cve/CVE-2026-86289
Third Party Advisory
Source: cverecord
https://vuldb.com/submit/906136
ExploitIssue Tracking
Source: cverecord
https://github.com/ollama/ollama/issues/17033
Issue TrackingPatch
Source: cverecord
https://github.com/ollama/ollama/pull/17062
Patch
Source: cverecord
https://github.com/ollama/ollama/commit/67b6a1c2d45321e0cb3c04a18073f9818de7724b
Patch
Source: cverecord
https://github.com/ollama/ollama/releases/tag/v0.31.2-rc1

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-190CWE-189

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