CVE-2026-66065
High · CVSS 8.4Published 2026-08-03
CVSS
8.4
High
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is 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. 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.
CVSS Score Explained
CVSS 8.4 is High severity. Exploitation is likely straightforward and the impact is significant — data loss, privilege escalation, or remote code execution are common outcomes. Patch as soon as possible.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- PATCHhttps://github.com/Q00/ouroboros/releases/tag/v0.42.1
- ›https://github.com/Q00/ouroboros/security/advisories/GHSA-jv2h-4p9v-wf5w
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