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

Quick assessment

Affected
nyariv SandboxJS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SandboxJS是nyariv个人开发者的一个安全评估软件。 SandboxJS 0.8.36之前版本存在安全漏洞，该漏洞源于解析器存在无限递归，可能导致进程崩溃。

AI Predicted 7.5 Difficulty: Easy EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-34211

Vulnerability Information
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Vulnerability Title
SandboxJS: Stack overflow DoS via deeply nested expressions in recursive descent parser
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
SandboxJS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SandboxJS是nyariv个人开发者的一个安全评估软件。 SandboxJS 0.8.36之前版本存在安全漏洞，该漏洞源于解析器存在无限递归，可能导致进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nyariv SandboxJS < 0.8.36 -

II. Public POCs for CVE-2026-34211

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III. Intelligence Information for CVE-2026-34211

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Vendor Advisories for CVE-2026-34211 (1)

Same Patch Batch · nyariv · 2026-04-06 · 3 CVEs total

CVE-2026-34208 10.0 CRITICAL SandboxJS: Sandbox integrity escape
CVE-2026-34217 SandboxJS has a Sandbox Escape via Prop Object Leak in New Handler

IV. Related Vulnerabilities

Same product: SandboxJS
Same vendor: nyariv
Same weakness: CWE-674

V. Comments for CVE-2026-34211

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