What’s Vulnerable › Vulnerabilities

CVE-2026-25142: SandboxJS Prototype Pollution -> Sandbox Escape -> RCE

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-02 · updated 2026-06-17
• Weakness: CWE-94

Description

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.

Affected products

• nyariv SandboxJS: before 0.8.27 — fixed in 0.8.27

How to fix

Upgrade to a fixed version: nyariv SandboxJS 0.8.27. Check the vendor advisory for mitigations.

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

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