CVE-2026-66065
Local .env bypass allows RCE in Ouroboros AI agent runtimes (patched in 0.42.1).
Is CVE-2026-66065 being exploited?
Not confirmed. CVE-2026-66065 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.30% probability of exploitation in the next 30 days.
How severe is CVE-2026-66065?
CVE-2026-66065 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-66065?
Yes. A fix has been recorded for CVE-2026-66065. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-66065 affect?
CVE-2026-66065 affects Ouroboros <0.42.1, Developer workstations running Ouroboros, Local AI agent runtimes, plugins, MCP servers. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-66065?
Upgrade to >=0.42.1, remove/untrust local .env files, audit config-home and plugin roots.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Malicious cloned repo with crafted .env can achieve arbitrary command execution, hijack agents/backends, alter plugins and weaken approval gates.
Immediate action required
- affected< 0.42.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.