T08 · Insecure Dependencies
Warning
- Location
SKILL.md:85- Finding
Unpinned Third-Party Package Execution Through npx
- Content
View full analysis
Vulnerability Details
File Location:
SKILL.md, lines 85–94
Vulnerability Type: Unpinned third-party dependency execution
Risk Level: MediumVulnerable Code
markdown ## Using with x402-payment ### CLI (AI Agent) ```bash npx @springmint/x402-payment \ --url https://www.cpbox.io/api/x402/answers \ --method POST \ --input '{"messages":[{"role":"user","content":"How does the James Webb Space Telescope work?"}],"model":"default","stream":false}'text ### Technical Analysis The documented command invokes `@springmint/x402-payment` through `npx` without specifying an exact package version or enforcing an integrity hash. If the package is not already installed locally, `npx` can retrieve and immediately execute a package release from the configured npm registry. This creates a supply-chain trust boundary in which the executed implementation can change after the Skill has been reviewed. Compromise of the package publisher account, registry resolution, or a future package release could cause attacker-controlled code to run when an agent follows the documented integration procedure. The risk is elevated because the package is expected to handle an x402 payment handshake and EIP-712 signing. ### Attack Path 1. An attacker compromises the upstream package, its publisher account, or the dependency publication process. 2. A malicious version of `@springmint/x402-payment` is published or otherwise resolved by the runtime. 3. An agent follows `SKILL.md` and executes the unversioned `npx @springmint/x402-payment` command. 4. `npx` downloads and runs the attacker-controlled package with the invoking process's operating-system privileges. 5. The malicious package can inspect accessible environment data and payment-related material, manipulate API requests or payment destinations, and perform other actions permitted to the process. ### Impact Assessment Successful exploitation can provide ar ...[truncated 555 chars]- Remediation
View remediation
Remediation Suggestions
- Pin the package to a specifically reviewed version, such as
@springmint/x402-payment@X.Y.Z, rather than resolving the latest available release. - Install dependencies through a committed lockfile containing registry URLs and integrity metadata, and use a deterministic installation command such as
npm ci. - Verify package provenance, publisher identity, release signatures, and integrity before approving upgrades.
- Avoid automatic download-and-execute behavior in production. Prefer a separately reviewed installation stage followed by execution of the pinned local binary.
- Run the payment client in a restricted environment with minimal filesystem access, filtered network egress, sanitized environment variables, and no unrelated credentials.
- Scope payment and EIP-712 signing authorization to the expected domain, contract, network, amount, and request. Require explicit confirmation for values outside defined limits.
- Monitor dependency advisories and review all version changes before updating the approved package.
- Pin the package to a specifically reviewed version, such as