CVE-2026-43898
Critical · 10.0CVSS
10.0
EPSS
0.6%
Published
May 28, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | @nyariv/sandboxjs | 0 | 0.9.6 |
Related vulnerabilities
- GHSA-g8f2-4f4f-5jqw SandboxJS has a sandbox escape via Function.caller leakage of internal call op Same vulnerability
- CVE-2026-34208 SandboxJS is a JavaScript sandboxing library. Also affects @nyariv/sandboxjs
- CVE-2026-34217 SandboxJS is a JavaScript sandboxing library. Also affects @nyariv/sandboxjs
- CVE-2026-34211 SandboxJS is a JavaScript sandboxing library. Also affects @nyariv/sandboxjs
- GHSA-hg73-4w7g-q96w SandboxJS: Sandbox Escape via Prop Object Leak in New Handler Also affects @nyariv/sandboxjs
- GHSA-8pfc-jjgw-6g26 SandboxJS: Stack overflow DoS via deeply nested expressions in recursive descent parser Also affects @nyariv/sandboxjs
- GHSA-2gg9-6p7w-6cpj SandboxJS: Sandbox integrity escape Also affects @nyariv/sandboxjs
- CVE-2026-32723 SandboxJS is a JavaScript sandboxing library. Also affects @nyariv/sandboxjs