CVE-2026-5757 Ollama AI CVE debrief

Who should care

Organizations using Ollama versions up to 0.13.5 should prioritize patching this vulnerability to prevent potential sensitive data exposure and further compromise. Security teams should review their inventory of Ollama installations and ensure that all instances are updated to a patched version. Additionally, defenders should monitor for potential exploitation attempts and implement compensating controls to detect and prevent suspicious activity.

Technical summary

The vulnerability exists in Ollama's model quantization engine, which allows an attacker to read and exfiltrate the server's heap memory without authentication. The vulnerability has a CVSS vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, indicating that it can be exploited over the network with low attack complexity and no privileges required. The vulnerability is classified as CWE-125, which is a weakness related to out-of-bounds read.

Defensive priority

High priority should be given to patching this vulnerability, as it can lead to sensitive data exposure and further compromise. Defenders should review their inventory of Ollama installations and ensure that all instances are updated to a patched version.

Recommended defensive actions

• Review and update Ollama installations to ensure that all instances are running a patched version.
• Monitor for potential exploitation attempts and implement compensating controls to detect and prevent suspicious activity.
• Implement additional security measures to protect sensitive data and prevent further compromise.
• Review and update incident response plans to ensure preparedness in case of a potential breach.
• Conduct a thorough risk assessment to identify potential vulnerabilities and prioritize remediation efforts.

Evidence notes

The CVE-2026-5757 vulnerability was identified in Ollama's model quantization engine, which allows an attacker to read and exfiltrate the server's heap memory without authentication. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. The CVE was published on June 26, 2026, and last modified on June 29, 2026. The vulnerability affects Ollama versions up to 0.13.5.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.