CVE-2026-25586

Published: Feb 6, 2026Modified: Jun 17, 2026

10.0

Vector

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

Exploitability: 3.9 / Impact: 6.0

Source: security-advisories@github.com (Secondary)

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29.

Affected (1)

Products: Nyariv: Sandboxjs

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Nyariv Sandboxjs	Before 0.8.29

Related CWEs

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

References (3)

https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3

Source: security-advisories@github.com

Patch

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48

Source: security-advisories@github.com

ExploitVendor Advisory

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

ExploitVendor Advisory

Timeline

No history available yet.