Vulnerability · Published Aug 3, 2026 · Assigned by GitHub_M
CVE-2026-47211Ouroboros: Remote Code Execution via Untrusted Project-Directory .env
High 8.4
In plain English
A high-severity security flaw in ouroboros from Q00. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Ouroboros is a local-first runtime for AI coding agents that records their actions and applies user-defined policies to constrain behavior. In versions prior to 0.39.0, if a user clones a malicious repository and runs Ouroboros commands within that directory, it can lead to arbitrary code execution and potential system takeover. The vulnerability stems from Ouroboros loading the .env file from the current working directory. Execution-affecting environment variables such as OUROBOROS_CLI_PATH, OPENCODE_CLI_PATH, and other backend selectors are accepted directly from this local .env. An attacker can include a malicious script in the repository and point the CLI path variable to it (e.g., OUROBOROS_CLI_PATH=./malicious_script.sh). When the user executes a command like ouroboros init or any command that instantiates the adapter, the malicious script is executed instead of the intended CLI. This issue has been fixed in version 0.39.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | ouroboros-ai | 0.39.0 | GHSA-c4m7-2gwp-vw76 |
| PyPI | ouroboros-ai | 0.39.0 | PYSEC-2026-2857 |
Affected products (as reported)
Weakness: CWE-426 · Vector: 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
References
- https://github.com/Q00/ouroboros/security/advisories/GHSA-c4m7-2gwp-vw76 x_refsource_CONFIRM
- https://github.com/Q00/ouroboros/pull/1078 x_refsource_MISC
- https://github.com/Q00/ouroboros/commit/4e70b760b4eb157469b58645339ba831f6513d37 x_refsource_MISC