CVE-2026-25587

PoC —

CVSS 3.1

10.0 critical

EPSS

<1%p49

Published

Feb 6, 2026 (Feb 6, 2026)

Modified

Jun 17, 2026

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.

Vendors: nyariv
Products: sandboxjs
Weakness: CWE-94
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.7%)

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