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CVE PROGRAM SOURCE RECORD10.0 Critical

CVE-2026-43898

SandboxJS: Sandbox escape via Function.caller leakage of internal call op

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

nyariv SandboxJS

  • < 0.9.6affected

References