CVE-2026-25587 | THREATINT

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, as Map is in SAFE_PROTOYPES, it's prototype can be obtained via Map.prototype. By overwriting Map.prototype.has the sandbox can be escaped. This vulnerability is fixed in 0.8.29.

PUBLISHED Reserved 2026-02-03 | Published 2026-02-06 | Updated 2026-02-06 | 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

< 0.8.29

affected

References

github.com/...dboxJS/security/advisories/GHSA-66h4-qj4x-38xp exploit

github.com/...dboxJS/security/advisories/GHSA-66h4-qj4x-38xp

github.com/...ommit/67cb186c41c78c51464f70405504e8ef0a6e43c3

cve.org (CVE-2026-25587)

nvd.nist.gov (CVE-2026-25587)

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