Bug 2529324 (CVE-2026-86289)

Summary: CVE-2026-86289 github.com/ollama/ollama: Ollama: Denial of Service via Integer Overflow in GGUF Decoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Ollama's GGUF Decoder component. A remote attacker can exploit an integer overflow vulnerability in the `readGGUFV1String` function by performing a manipulation. This could lead to a denial of service (DoS), making the affected system unavailable.
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Description OSIDB Bzimport 2026-09-07 08:51:34 UTC
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.