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CVE-2026-34211

SandboxJS: Stack overflow DoS via deeply nested expressions in recursive descent parser

Published: Apr 6, 2026Updated: Apr 9, 2026 Sources: CVE List NVDCWE-674
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 68.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-674

Affected Products

sandboxjsnyariv
On-prem
Security Products / vuln-mgmt-scanner
SandboxJSnyariv
On-prem
Security Products / vuln-mgmt-scanner
nyarivindividual-devSecurity Productsaka sandboxjs

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Workaround Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-8pfc-jjgw-6g26
github.com

Timeline

Published
Apr 6, 2026
Last Updated
Apr 9, 2026

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