CVE-2026-65315: 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 G

highCVSS 7.5CVE-2026-65315

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.5
Published: 2026-07-21
Last updated: 2026-07-22
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-65315

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-653150.57% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 44% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-65315	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[NEW] [medium] Ollama: Vulnerability allows denial of servicecert-bund

Recent advisories for Ollama

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[NEW] [medium] Ollama: Vulnerability allows denial of servicecert-bund · 2026-07-22
medium[NEW] [UNPATCHED] [medium] Ollama: Vulnerability allows denial of servicecert-bund · 2026-07-14
highCVE-2026-15685: Ollama downloadBlob Improper Validation of Array Index Denial-of-Service Vulnerability. This v…nvd · 2026-07-13
criticalCVE-2026-59706: mem0 contains unauthenticated config API endpoints that expose LLM API keys in plaintext and a…nvd · 2026-07-07
highCVE-2026-5757: Unauthenticated remote information disclosure vulnerability in Ollama's model quantization engi…nvd · 2026-06-26