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CVE-2026-34211

MEDIUM CVSS 4.0: 6.9 EPSS 0.06%
Updated Apr 09, 2026
Sandboxjs
Parameter Value
CVSS 6.9 (MEDIUM)
Affected Versions before 0.8.36
Fixed In 0.8.36
Type CWE-674
Vendor Sandboxjs
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption

CVSS Vector v4.0

Weakness Type (CWE)

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Nyariv Sandboxjs
cpe:2.3:a:nyariv:sandboxjs:*:*:*:*:*:node.js:*:*
0.8.36