CVE-2026-15685 Ollama CVE debrief

Who should care

Users and administrators of Ollama installations should be aware of this vulnerability and take steps to mitigate it. This includes applying vendor patches or updates as soon as they become available, restricting access to the Ollama installation to trusted users only, and monitoring Ollama installations for suspicious activity.

Technical summary

The vulnerability exists within the downloadBlob function of Ollama. 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. The vulnerability has a CVSS score of 7.5 and is considered HIGH severity. This Denial-of-Service vulnerability in Ollama is caused by improper validation of array indices in the downloadBlob function, allowing remote attackers to create a denial-of-service condition on affected installations without requiring authentication. Users and administrators should apply vendor patches or updates as soon as they become available and restrict access to trusted users only.

Defensive priority

High

Recommended defensive actions

• Apply vendor patches or updates as soon as they become available
• Restrict access to the Ollama installation to trusted users only
• Monitor Ollama installations for suspicious activity
• Consider implementing compensating controls such as web application firewalls
• Review and update incident response plans to include procedures for responding to potential exploitation of this vulnerability
• Conduct a thorough review of Ollama installations to identify potential vulnerabilities and prioritize remediation efforts
• Implement additional security controls such as network segmentation and isolation to limit the potential impact of a successful exploit

Evidence notes

The CVE record was published on 2026-07-13T22:16:46.123Z and has not been modified since then. The NVD entry is currently in the 'Received' status. There is no additional information available about the vulnerability beyond what is provided in the CVE record and NVD entry. Users should verify the accuracy of this information with the vendor or other sources.

Official resources