Vulnerability in Ollama
CVE-2026-15685
Ollama downloadBlob Improper Validation of Array Index Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Ollama. Authentication is not required to exploit this vulnerability. The specific flaw exists within the downloadBlob function. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated array. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-27277.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Ollama — versions 0.7.1
Weakness classification (CWE)
References
- www.zerodayinitiative.com/advisories/ZDI-26-403/ (x_research-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-15685?
- CVE-2026-15685 is a high-severity vulnerability in Ollama, classified under Improper Validation of Array Index. CVSS score: 7.5/10. Published 2026-07-13.
- How severe is CVE-2026-15685?
- High severity. CVSS v3 base score is 7.5 out of 10.