SandboxJS is a JavaScript sandboxing library.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. May 28, 2026 · NIST NVD

   Detected

   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

2. Oct 14, 2026 · NIST NVD

   Updated

   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

Affected

• cpe nyariv/sandboxjsversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-43898

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-43898

  30-day exploitation probability 0.6%

  first.org
• NIST NVDVulnerability recordCVE-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 t

  nvd.nist.gov

References

• Patch · github.com
• Exploit · github.com