All versions of localeval are vulnerable to Sandbox Escape leading to Remote Code Execution. The package fails to restrict access to the main context through constructor.constructor. This may allow attackers to execute arbitrary code in the system. Evaluating the payload

constructor.constructor("return process.env")()

returns the contents of process.env.

Recommendation

No fix is currently available. Consider using an alternative package until a fix is made available.

References

• espadrine/localeval#9
• espadrine/localeval@823f112
• espadrine/localeval@ce985eb