Q00 Ouroboros up to 0.38.x Environment Variable Loading OUROBOROS_CLI_PATH/OPENCODE_CLI_PATH os command injection

Summaryinfo

A vulnerability was found in Q00 Ouroboros up to 0.38.x and classified as critical. This affects an unknown part of the component Environment Variable Loading. The manipulation of the argument OUROBOROS_CLI_PATH/OPENCODE_CLI_PATH results in os command injection. This vulnerability is reported as CVE-2026-47211. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in Q00 Ouroboros up to 0.38.x. Affected is an unknown code of the component Environment Variable Loading. The manipulation of the argument OUROBOROS_CLI_PATH/OPENCODE_CLI_PATH with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-47211 since 05/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 0.39.0 eliminates this vulnerability.

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Productinfo

Vendor

• Q00

Name

• Ouroboros

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36
• 0.37
• 0.38

Website

• Product: https://github.com/Q00/ouroboros/

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