CVE-2026-25520
CRITICAL
GHSA-58jh-xv4v-pcx4
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4Description
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox. This vulnerability is fixed in 0.8.29.
Analysis
SandboxJS has a second CVSS 10.0 sandbox escape where function return values aren't properly sanitized, allowing code execution outside the sandbox.
Sign in for full analysis, threat intelligence, and remediation guidance.
Remediation
Within 24 hours: Inventory all systems and applications using SandboxJS and identify which versions are deployed; immediately disable SandboxJS functionality if operationally feasible pending patching. Within 7 days: Apply vendor patch to upgrade SandboxJS to version 0.8.29 or later across all affected systems; conduct full application testing post-patch to ensure functionality. …
Sign in for detailed remediation steps.
Priority Score
Share
External POC / Exploit Code
Leaving vuln.today