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CVE-2026-43898— SandboxJS: Sandbox escape via Function.caller leakage of internal call op

Quick assessment

Affected
nyariv SandboxJS
Exploitation
Public or AI PoC available; prioritize validation
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 0.9.6之前版本存在安全漏洞，该漏洞源于沙盒定义的函数暴露Function.caller，可能导致沙盒代码恢复内部回调并执行任意主机JavaScript。

CVSS 10.0 · Critical EPSS 0.63% · P49

Affected Version Matrix 1

VendorProduct Version RangeStatus
nyariv SandboxJS < 0.9.6 affected
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I. Basic Information for CVE-2026-43898

Vulnerability Information
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Vulnerability Title
SandboxJS: Sandbox escape via Function.caller leakage of internal call op
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
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 0.9.6之前版本存在安全漏洞，该漏洞源于沙盒定义的函数暴露Function.caller，可能导致沙盒代码恢复内部回调并执行任意主机JavaScript。
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 < 0.9.6 -

II. Public POCs for CVE-2026-43898

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6616 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-43898

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Patches & Fixes for CVE-2026-43898 (1)

Vendor Advisories for CVE-2026-43898 (1)

IV. Related Vulnerabilities

Same product: SandboxJS
Same vendor: nyariv
Same weakness: CWE-94

V. Comments for CVE-2026-43898

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