Remote service crash via unbounded GGUF allocations
Published Jul 21, 2026 · Updated Jul 21, 2026
Uncontrolled memory allocation in Ollama through f0078ae allows remote attackers to crash the server via a crafted GGUF file. The fs/ggml/gguf.go parser passes untrusted string lengths, tensor dimension counts, and metadata array counts to allocation or slice operations before checking the bytes remaining. API access to blob upload plus model creation, or a pull from an untrusted registry, triggers a fatal out-of-memory error or unrecovered panic that terminates the process.
Summary
What happened
Uncontrolled memory allocation in Ollama through f0078ae allows remote attackers to crash the server via a crafted GGUF file. The fs/ggml/gguf.go parser passes untrusted string lengths, tensor dimension counts, and metadata array counts to allocation or slice operations before checking the bytes remaining. API access to blob upload plus model creation, or a pull from an untrusted registry, triggers a fatal out-of-memory error or unrecovered panic that terminates the process.
The record
- CVE
- CVE-2026-65315
- Published
- Jul 21, 2026
- Updated
- Jul 21, 2026
- Vendor
- Ollama
- Product
- Ollama
- Classifications
- CWE-789, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 21, 2026CVE publishedPublication date reported by the CVE source.
- Jul 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=f0078ae
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Crafted GGUF allocation test casesproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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