CVE-2026-26954

Name: CVE-2026-26954
Creator: NVD / NIST
Published: 2026-03-13T19:54:31.143+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10EPSS 0.55%

Last modified Jun 17, 2026

CVE-2026-26954 is a critical-severity vulnerability rated 10/10 on the CVSS scale. SandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Function, which allows escaping the sandbox. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Function, which allows escaping the sandbox. Given an array containing Function, and Object.fromEntries, it is possible to construct {[p]: Function} where p is any constructible property. This vulnerability is fixed in 0.8.34.

Metrics

CVSS 3.1

10/10

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

EPSS Probability

0.55%

41.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Nyariv	Sandboxjs	< 0.8.34

References

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-6r9f-759j-hjgvExploit, Vendor Advisory
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-6r9f-759j-hjgvExploit, Vendor Advisory

Timeline

Published: Mar 13, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-26954?

How severe is CVE-2026-26954?

CVE-2026-26954 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.

How do I fix CVE-2026-26954?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-26954?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST