CVE-2026-90813
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk24th percentile - higher than 24% of all known CVEs
Summary
A vulnerability exists in cosmicstack-labs mercury-agent up to 1.1.13 in the checkShellCommand function of src/capabilities/permissions.ts (Shell Command Execution component). The flaw is an incorrect behavior order: validate before canonicalize, and the exploit is publicly available.
Risk Assessment
A remote attacker can bypass shell command validation, potentially leading to execution of unauthorized commands on the system.
Recommendation
Report the issue to the project (no response to the issue report yet) and consider implementing correctly ordered validation (canonicalize before validate) until a fix is released.
Other vulnerabilities in mercury-agent
See all- CVE-2026-90814Medium
A flaw exists in cosmicstack-labs mercury-agent up to 1.1.13 in the githubRequest function of src/utils/github.ts (GitHub API Handler component). Manipulating the path argument causes server-side request forgery, and the exploit has been publicly disclosed.
- CVE-2026-90811Low
In cosmicstack-labs mercury-agent up to 1.2.0, the PermissionManager.checkShellCommand function in mercury-agent/src/capabilities/permissions.ts (Shell Permission Manifest component) can lead to information disclosure via manipulation. The attack is restricted to local execution and the exploit is publicly available.
- CVE-2026-18998Medium
A vulnerability in cosmicstack-labs mercury-agent up to 1.1.12 affects the function SubAgent.run in src/core/sub-agent.ts, causing improper authorization. Remote attack is possible and exploit is public.
- CVE-2026-18997Medium
A vulnerability in cosmicstack-labs mercury-agent up to 1.1.12 affects the function Agent.handleBgCommand in src/core/agent.ts, causing incorrect authorization. Remote attack is possible and exploit is public.
- CVE-2026-18996Medium
A vulnerability has been found in cosmicstack-labs mercury-agent up to 1.1.12, affecting the function PermissionManager.checkShellCommand in the file src/capabilities/permissions.ts in the run_command Handler component. Such manipulation leads to incorrect privilege assignment. The attack may be performed remotely, and the exploit has been publicly disclosed.
Original NVD description (English source)
A vulnerability was detected in cosmicstack-labs mercury-agent up to 1.1.13. Affected is the function checkShellCommand of the file src/capabilities/permissions.ts of the component Shell Command Execution. The manipulation results in incorrect behavior order: validate before canonicalize. The attack may be launched remotely. The exploit is now public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS