Is CVE-2026-43898 actively exploited?

No active exploitation of CVE-2026-43898 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-43898 be exploited remotely?

Yes. CVE-2026-43898 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-43898?

CVE-2026-43898 has a CVSS score of 10.0 (CRITICAL).

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CRITICAL

CVE-2026-43898

CWE-94Published: May 28, 2026· Updated: May 28, 2026

10.0

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:14.9th

Official Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript. This vulnerability is fixed in 0.9.6.

NVD Source

Risk Analysis

This critical vulnerability in SandboxJS allows sandboxed JavaScript code to escape its environment. By exploiting a flaw in how functions expose Function.caller, an attacker can gain full control over the host system. The CVSS score of 10.0 highlights the extreme severity and urgency of addressing this issue.

No public exploit is currently known for this vulnerability. However, its remote exploitability (AV:N) and low attack complexity (AC:L) make it a significant threat if an exploit were to emerge.

Recommended Action

Upgrade SandboxJS to version 0.9.6 or later to fix this vulnerability. Ensure all instances of SandboxJS are updated promptly to prevent potential sandbox escapes.

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-2026-43898 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.