CVE-2026-34211 MEDIUM

CVE-2026-34211: SandboxJS: Stack overflow DoS via deeply nested expressions in recursive descent parser

Vendor Nyariv
Product SandboxJS
Weakness CWE-674
Published April 6, 2026
Last update April 7, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 6, 2026 CVE published
April 7, 2026 Record updated