CVE-2026-86289: Integer Overflow (CVSS 4.3)

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.

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

EPSS — Exploit Prediction

0.0040

Probability of exploitation

0.34%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-189 CWE-189

CWE-190 Integer Overflow

References

Other References

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

Frequently Asked Questions

What is CVE-2026-86289? +

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. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2026-86289? +

CVE-2026-86289 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0040, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-86289? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2026-86289