Vulnerability Description
SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, the @nyariv/sandboxjs parser contains unbounded recursion in the restOfExp function and the lispify/lispifyExpr call chain. An attacker can crash any Node.js process that parses untrusted input by supplying deeply nested expressions (e.g., ~2000 nested parentheses), causing a RangeError: Maximum call stack size exceeded that terminates the process. This vulnerability is fixed in 0.8.36.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nyariv | Sandboxjs | < 0.8.36 |
Related Weaknesses (CWE)
References
- https://github.com/nyariv/SandboxJS/security/advisories/GHSA-8pfc-jjgw-6g26ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-34211?
CVE-2026-34211 is a vulnerability with a CVSS score of 7.5 (HIGH). SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, the @nyariv/sandboxjs parser contains unbounded recursion in the restOfExp function and the lispify/lispifyExpr call chain. An attacker c...
How severe is CVE-2026-34211?
CVE-2026-34211 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34211?
Check the references section above for vendor advisories and patch information. Affected products include: Nyariv Sandboxjs.