CVE-2026-43898 — SandboxJS: Sandbox escape via Function.caller leakage of internal call op
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 run…
Published: 2026-05-28 · CVSS: 10.0 · CVSS 3.1
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 · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7