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Description

A prototype pollution vulnerability exists in @nyariv/sandboxjs versions <= 0.8.23, allowing attackers to inject arbitrary properties into Object.prototype via crafted JavaScript code. This can result in a denial-of-service (DoS) condition or, under certain conditions, escape the sandboxed environment intended to restrict code execution. The vulnerability stems from insufficient prototype access checks in the sandbox’s executor logic, particularly in the handling of JavaScript function objects returned.

PUBLISHED Reserved 2025-04-15 | Published 2025-07-31 | Updated 2025-07-31 | Assigner VulnCheck




HIGH: 7.0CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Product status

Default status
unaffected

* (semver)
affected

Credits

Hagrid29 finder

References

gist.github.com/Hagrid29/9df27829a491080f923c4f6b8518d7e3 issue-tracking exploit

github.com/nyariv/SandboxJS/issues/31 patch vendor-advisory

www.npmjs.com/package/@nyariv/sandboxjs product

www.vulncheck.com/...-prototype-pollution-sandbox-escape-dos third-party-advisory

cve.org (CVE-2025-34146)

nvd.nist.gov (CVE-2025-34146)

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