CVE-2026-43898 | THREATINT

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.

PUBLISHED Reserved 2026-05-04 | Published 2026-05-28 | Updated 2026-05-28 | Assigner GitHub_M

CRITICAL: 10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Problem types

CWE-94: Improper Control of Generation of Code ('Code Injection')

Product status

< 0.9.6

affected

References

github.com/...dboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw exploit

github.com/...dboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw

github.com/...ommit/826865251232611ec94078bab5a18ec875dad4a5

cve.org (CVE-2026-43898)

nvd.nist.gov (CVE-2026-43898)

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