CVE-2026-25142 PUBLISHED

SandboxJS Prototype Pollution -> Sandbox Escape -> RCE

Assigner: GitHub_M
Reserved: 29.01.2026 Published: 02.02.2026 Updated: 02.02.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 10

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	nyariv
Product	SandboxJS
Versions	Version < 0.8.27 is affected

References

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

Problem Types

CWE-94: Improper Control of Generation of Code ('Code Injection') CWE