CVE-2026-15685: (0Day) Ollama downloadBlob Improper Validation of Array Index Denial-of-Service Vulnerability
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch ZDI-CAN-27277 - Compensating control
If you cannot patch immediately, block or restrict inbound network traffic to Ollama to prevent remote attackers from reaching the vulnerable downloadBlob functionality (ZDI-CAN-27277).
Event History
Frequently Asked Questions
What is the severity of CVE-2026-15685?
The severity of CVE-2026-15685 is rated high with a score of 7.5.
What type of vulnerability is CVE-2026-15685?
CVE-2026-15685 is an Improper Validation of Array Index Denial-of-Service vulnerability.
How can CVE-2026-15685 be exploited?
CVE-2026-15685 can be exploited by remote attackers to create a denial-of-service condition without requiring authentication.
What is the impact of CVE-2026-15685 on affected systems?
CVE-2026-15685 can lead to a denial-of-service condition affecting the availability of the Ollama application.
How do I fix CVE-2026-15685?
To mitigate CVE-2026-15685, users should update to the latest version of Ollama where the vulnerability has been patched.