CVE-2026-86289

MEDIUM 4.3

Ollama GGUF Decoder gguf.go readGGUFV1String integer overflow

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-190 CWE-189
Vendor	n/a
Product	ollama
Published	Sep 7, 2026
Last Updated	Sep 11, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

n/a / Ollama

0.31.0 0.31.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/399448 vuldb.com: https://vuldb.com/vuln/399448/cti vuldb.com: https://vuldb.com/cve/CVE-2026-86289 vuldb.com: https://vuldb.com/submit/906136 github.com: https://github.com/ollama/ollama/issues/17033 github.com: https://github.com/ollama/ollama/pull/17062 github.com: https://github.com/ollama/ollama/commit/67b6a1c2d45321e0cb3c04a18073f9818de7724b github.com: https://github.com/ollama/ollama/releases/tag/v0.31.2-rc1 github.com: https://github.com/ollama/ollama/

Credits

🔍 m00dy (VulDB User)