CVE-2026-47211: Ouroboros ai Remote Code Execution Vulnerability
HIGHCVE-2026-47211 is a HIGH remote code execution vulnerability (CWE-426: Untrusted Search Path) affecting Ouroboros ai libraries in the PyPI ecosystem. The issue involves ouroboros-ai vulnerable to remote code execution via untrusted project-directory .env. Remediation is available by upgrading affected packages to version 0.39.0.
CVE-2026-47211 at a Glance
How to Fix CVE-2026-47211
To remediate this vulnerability, upgrade all affected Ouroboros ai dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
pip install ouroboros-ai>=0.39.0Run the following command in your project directory to verify that all resolved dependencies use the patched release:
pip show ouroboros-aiHow to Check if You Are Affected
To determine whether your Python environment is affected by CVE-2026-47211, inspect your installed packages using pip:
pip show ouroboros-aiAnalyze the terminal output to locate any version of Ouroboros ai in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.39.0), your application is affected.
Note: The pip show ouroboros-ai command checks currently installed packages in your active Python environment.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-426: Untrusted Search Path, where the product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control. In Ouroboros ai, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-47211 Affected Ouroboros ai Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
ouroboros-ai
|
PyPI |
< 0.39.0
|
0.39.0
|
References
Frequently Asked Questions
What is CVE-2026-47211?
Which Ouroboros ai versions are affected?
What version fixes CVE-2026-47211?
Is ouroboros-ai affected?
What CWE is associated with CVE-2026-47211?
How can I check PyPI dependencies for CVE-2026-47211?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-c4m7-2gwp-vw76",
"modified" : "2026-05-29T21:22:41Z",
"published" : "2026-05-29T21:22:41Z",
"aliases" : [ "CVE-2026-47211" ],
"summary" : "ouroboros-ai Vulnerable to Remote Code Execution via Untrusted Project-Directory .env",
"details" : "### Impact\nA Remote Code Execution (RCE) vulnerability was discovered in Ouroboros. 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.\n\nThe vulnerability (CWE-426: Untrusted Search Path & CWE-15: External Control of System Setting) stems from Ouroboros loading the `.env` file from the current working directory. Prior to the patch, execution-affecting environment variables such as `OUROBOROS_CLI_PATH`, `OPENCODE_CLI_PATH`, and other backend selectors were accepted directly from this local `.env`. An attacker could 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.\n\n### Patches\nThe vulnerability has been patched in version 0.39.0 via PR #1078.\nThe fix establishes a strict trust boundary by applying a denylist to project-local `.env` loading. It blocks execution-affecting environment variables (such as runtime selectors and CLI path overrides) from being loaded from the project directory. Explicit constructor overrides and trusted user-owned home configurations (`~/.ouroboros/.env`) remain fully functional. \n\nUsers are strongly advised to upgrade to version 0.39.0 or later.\n\n### Workarounds\nIf upgrading is not immediately possible, users must carefully inspect any `.env` file inside cloned repositories before running Ouroboros commands to ensure it does not contain unexpected `OUROBOROS_*_CLI_PATH` or `OPENCODE_CLI_PATH` overrides.\n\n### References\n- GitHub PR: https://github.com/Q00/ouroboros/pull/1078",
"severity" : [ {
"type" : "CVSS_V4",
"score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "PyPI",
"name" : "ouroboros-ai"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.39.0"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/Q00/ouroboros/security/advisories/GHSA-c4m7-2gwp-vw76"
}, {
"type" : "WEB",
"url" : "https://github.com/Q00/ouroboros/pull/1078"
}, {
"type" : "WEB",
"url" : "https://github.com/Q00/ouroboros/commit/4e70b760b4eb157469b58645339ba831f6513d37"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/Q00/ouroboros"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-426" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-05-29T21:22:41Z",
"nvd_published_at" : null
}
}