CVE-2026-25587

SandboxJS has a Sandbox Escape

CVSS 10 CRITICALEPSS 0.6%CWE-94

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

Affected products

nyariv · SandboxJS

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References

https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3 https://github.com/nyariv/SandboxJS/security/advisories/GHSA-66h4-qj4x-38xp