{"id":"CVE-2026-65315","summary":"Ollama Remote Denial of Service via Attacker-Controlled Allocation in GGUF Metadata Parser","details":"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.","modified":"2026-10-28T02:30:55.901607361Z","published":"2026-07-21T21:18:24.567Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-789"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65315.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65315.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65315"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/ollama-remote-denial-of-service-via-attacker-controlled-allocation-in-gguf-metadata-parser"},{"type":"REPORT","url":"https://github.com/ollama/ollama/issues/17042"},{"type":"FIX","url":"https://github.com/ollama/ollama"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ollama/ollama","events":[{"introduced":"0"},{"last_affected":"f0078ae"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"0"},{"last_affected":"f0078ae"}],"source":"AFFECTED_FIELD"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-65315.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}