Is CVE-2026-25586 actively exploited?

No active exploitation of CVE-2026-25586 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-25586 be exploited remotely?

Yes. CVE-2026-25586 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-25586?

CVE-2026-25586 has a CVSS score of 10.0 (CRITICAL).

HOME VULNERABILITIESCVE-2026-25586

CRITICAL

CVE-2026-25586

CWE-74Published: February 6, 2026· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official 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.

NVD Source

Risk Analysis

SandboxJS is vulnerable to a sandbox escape caused by shadowing the hasOwnProperty method, which bypasses prototype whitelist enforcement. This allows an attacker to pollute the host object prototype, resulting in a critical security failure with a CVSS score of 10.0.

No public exploit is currently known for this remotely exploitable vulnerability.

Recommended Action

Upgrade to SandboxJS version 0.8.29 to patch the prototype enforcement mechanism.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-25586 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.