Is CVE-2026-25520 actively exploited?

No active exploitation of CVE-2026-25520 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-25520 be exploited remotely?

Yes. CVE-2026-25520 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-25520?

CVE-2026-25520 has a CVSS score of 10.0 (CRITICAL).

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CRITICAL

CVE-2026-25520

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, The return values of functions aren't wrapped. Object.values/Object.entries can be used to get an Array containing the host's Function constructor, by using Array.prototype.at you can obtain the hosts Function constructor, which can be used to execute arbitrary code outside of the sandbox. This vulnerability is fixed in 0.8.29.

NVD Source

Risk Analysis

SandboxJS fails to properly wrap return values, allowing an attacker to access the host's Function constructor and execute arbitrary code outside the sandbox. This critical flaw carries a CVSS score of 10.0 and allows for complete system compromise.

This vulnerability is remotely exploitable, but there is no known public exploit available at this time.

Recommended Action

Apply the fix by upgrading to SandboxJS version 0.8.29.

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-2026-25520 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.