CVE WatchAug 3, 2026

CVE-2026-66065

Ouroboros is a local-first runtime for AI coding agents that records their actions and applies user-defined policies to constrain behavior.

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 3, 2026 · Last modified: Aug 3, 2026 · CWE-15 · CWE-94

EPSS · 30d

Not enough EPSS history yet.

Technical description

Ouroboros is a local-first runtime for AI coding agents that records their actions and applies user-defined policies to constrain behavior. Versions prior to 0.42.1 have an incomplete denylist. Several execution-routing keys of the same RCE class were omitted, so a malicious cloned repo can still reach arbitrary command execution by shipping a .env (auto-loaded at import, with no review step). The CVE-2026-47211 fix added _UNTRUSTED_ENV_DENYLIST to stop an untrusted project-directory .env from redirecting execution, but it did not account for all keys. The backend config-home and MCP/plugin roots bypass the approval gate by pointing the nested agent, MCP servers, and plugin roster at attacker config. Other variables re-enable blocked local transports, replace sub-agent prompts, switch backends, and lower tool approval classes, further weakening the approval gate. This issue has been fixed in version 0.42.1.

Official references

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