CVE-2026-65315

Summary

Ollama (HEAD f0078ae) contains an uncontrolled memory allocation vulnerability in the GGUF metadata parser that allows remote attackers to crash the server by supplying a crafted GGUF file with attacker-controlled length and count fields in string lengths, tensor dimension counts, and metadata array counts that are used as allocation sizes without validation against remaining file size. Attackers can upload a sub-1KB crafted GGUF file via the blob upload and model create or pull API endpoints to trigger unrecoverable Go runtime out-of-memory fatal errors or makeslice panics that bypass recovery middleware and crash the entire server process.

Affected Software

Weaknesses

• CWE-789: Memory Allocation with Excessive Size Value

References

• https://github.com/ollama/ollama/issues/17042
• https://github.com/ollama/ollama
• https://www.vulncheck.com/advisories/ollama-remote-denial-of-service-via-attacker-controlled-allocation-in-gguf-metadata-parser

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