CVE-2026-43898

SandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript. This vulnerability is fixed in 0.9.6.

CVSS v3 10.0 CRITICAL

10.0^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/nyariv/SandboxJS/commit/826865251232611ec94078bab5a18ec875dad4a5	Patch
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw	Exploit Vendor Advisory
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:nyariv:sandboxjs:*:*:*:*:*:node.js:*:*

History

14 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) SandboxJS es una biblioteca de sandboxing de JavaScript. Antes de 0.9.6, las funciones definidas en el sandbox exponen Function.caller, permitiendo que el código en el sandbox recupere la devolución de llamada interna de tiempo de ejecución LispType.Call. Esa devolución de llamada puede entonces ser invocada con valores de contexto y obj falsos controlados por el atacante para extraer estáticos de host bloqueados, recuperar el constructor de función de host real y ejecutar JavaScript de host arbitrario. Esta vulnerabilidad está corregida en 0.9.6.

Information

Published : 2026-05-28 18:16

Updated : 2026-10-14 20:10

NVD link : CVE-2026-43898

Mitre link : CVE-2026-43898

CVE.ORG link : CVE-2026-43898

JSON object : View

Products Affected

nyariv

sandboxjs

CWE

CWE-94

Improper Control of Generation of Code ('Code Injection')

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