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.

• CWE-94

• https://github.com/nyariv/SandboxJS/commit/826865251232611ec94078bab5a18ec875dad4a5Patch
• https://github.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqwExploit, Vendor Advisory
• https://github.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqwExploit, Vendor Advisory

Published

May 28, 2026

Last Modified

Jun 17, 2026

Status

Modified

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