CVE-2025-34146

HIGH EPSS 9.4%
Published Jul 31, 202511mo ago · Modified Jun 17, 20261w ago
7.0 CVSS 4.0
High
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Published Jul 31, 2025 11mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.0
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
9.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-1321

References 4

  • gist.github.com https://gist.github.com/Hagrid29/9df27829a491080f923c4f6b8518d7e3
  • github.com https://github.com/nyariv/SandboxJS/issues/31
  • npmjs.com https://www.npmjs.com/package/@nyariv/sandboxjs
  • vulncheck.com https://www.vulncheck.com/advisories/nyariv-sandboxjs-prototype-pollution-sandbox-escape-dos

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.