CVE-2026-47211: Ouroboros ai Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-c4m7-2gwp-vw76
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CWE-426
Published
Advisory Summary

CVE-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

CVE Identifier CVE-2026-47211
GHSA Identifier GHSA-c4m7-2gwp-vw76
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-426: Untrusted Search Path
Affected Product Ouroboros ai
Package Ecosystem PyPI
Published Date
Last Updated

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.

ouroboros-ai fixed: 0.39.0 
pip install ouroboros-ai>=0.39.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show ouroboros-ai

How 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-ai

Analyze 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

### Impact A 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. The 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. ### Patches The vulnerability has been patched in version 0.39.0 via PR #1078. The 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. Users are strongly advised to upgrade to version 0.39.0 or later. ### Workarounds If 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. ### References - GitHub PR: https://github.com/Q00/ouroboros/pull/1078

CVE-2026-47211 Affected Ouroboros ai Versions

1 component(s)
Fixed Versions:
0.39.0
Product / Package Ecosystem Affected Versions Fixed Version
ouroboros-ai
pypi/ouroboros-ai
PyPI
< 0.39.0
0.39.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/Q00/ouroboros/security/advisories/GHSA-c4m7-2gwp-vw76
Ouroboros ai Source Repository REPOSITORY
https://github.com/Q00/ouroboros/pull/1078
Security Fix Commit FIX COMMIT
https://github.com/Q00/ouroboros/commit/4e70b760b4eb157469b58645339ba831f6513d37
Ouroboros ai Source Repository REPOSITORY
https://github.com/Q00/ouroboros

Frequently Asked Questions

What is CVE-2026-47211?
CVE-2026-47211 is a security vulnerability in Ouroboros ai involving ouroboros-ai Vulnerable to Remote Code Execution via Untrusted Project-Directory .env under CWE-426: Untrusted Search Path.
Which Ouroboros ai versions are affected?
Affected versions include releases prior to 0.39.0 across affected packages: ouroboros-ai.
What version fixes CVE-2026-47211?
Upgrading to 0.39.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ouroboros-ai affected?
Yes, ouroboros-ai is affected in releases prior to 0.39.0. Upgrade your dependency to 0.39.0 or later.
What CWE is associated with CVE-2026-47211?
CVE-2026-47211 is classified under CWE-426: Untrusted Search Path (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.).
How can I check PyPI dependencies for CVE-2026-47211?
Run the dependency tree command: 'pip show ouroboros-ai'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "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
  }
}