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CVE-2026-66065— Ouroboros: Untrusted project .env can still reach RCE via omitted execution-routing keys (Incomplete fix of CVE-2026-47211)

Quick assessment

Affected
Q00 ouroboros
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Q00 Ouroboros是Q00个人开发者开源的一款区块链软件开发产品。 Q00 Ouroboros 0.42.1之前版本存在安全漏洞，该漏洞源于黑名单不完整，可能导致恶意克隆仓库通过.env文件绕过审批机制，执行任意命令。

CVSS 8.4 · High EPSS 0.30% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
Q00 ouroboros < 0.42.1 affected
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I. Basic Information for CVE-2026-66065

Vulnerability Information
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Vulnerability Title
Ouroboros: Untrusted project .env can still reach RCE via omitted execution-routing keys (Incomplete fix of CVE-2026-47211)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
系统设置或配置在外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
Q00 Ouroboros 配置错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Q00 Ouroboros是Q00个人开发者开源的一款区块链软件开发产品。 Q00 Ouroboros 0.42.1之前版本存在安全漏洞，该漏洞源于黑名单不完整，可能导致恶意克隆仓库通过.env文件绕过审批机制，执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Q00 ouroboros < 0.42.1 -

II. Public POCs for CVE-2026-66065

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8034 chars
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III. Intelligence Information for CVE-2026-66065

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Patches & Fixes for CVE-2026-66065 (1)

Vendor Advisories for CVE-2026-66065 (1)

IV. Related Vulnerabilities

Same product: ouroboros
Same vendor: Q00
Same weakness: CWE-15

V. Comments for CVE-2026-66065

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