CVE-2026-43898

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.

CVSS Vector

Affected Products

References

• https://github.com/nyariv/SandboxJS/commit/826865251232611ec94078bab5a18ec875dad4a5
• https://github.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw
• https://github.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw