CVE-2026-25587

🚨 CRITICAL

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 escape...

Published
Feb 06, 2026
Last Modified
Feb 06, 2026
Views
11
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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.

CVSS Scores

CVSS 3.1 10.0
10.0
CRITICAL
CVSS 2.0 10.0

Additional Information

Source
security-advisories@github.com
State
Undergoing analysis

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