CVE-2026-25142

SandboxJS Prototype Pollution -> Sandbox Escape -> RCE

CVSS 10 CRITICALEPSS 1.1%CWE-94

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.27, SanboxJS does not properly restrict __lookupGetter__ which can be used to obtain prototypes, which can be used for escaping the sandbox / remote code execution. This vulnerability is fixed in 0.8.27.

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/blob/f212a38fb5a6d4bc2bc2e2466c0c011ce8d41072/src/executor.ts#L368-L398 https://github.com/nyariv/SandboxJS/commit/75c8009db32e6829b0ad92ca13bf458178442bd3 https://github.com/nyariv/SandboxJS/security/advisories/GHSA-9p4w-fq8m-2hp7