← Vulnerability feed

Vulnerability record · CVE-2026-25520 · published 6 February 2026

CVE-2026-25520: Nyariv sandboxjs injection vulnerability

NNyariv · Sandboxjs

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.

10.0 CVSS 3.1 Critical EPSS 0.81% · top 44.7% CWE-74 · Injection
10.0CVSS 3.1 base score
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3 Patch
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4 ExploitVendor Advisory
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4 ExploitVendor Advisory

Track CVE-2026-25520 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2026-43898Nyariv sandboxjs code injection vulnerabilitySandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover th…EPSS 0.63%10.0CVE-2026-34208Nyariv sandboxjs mass assignment vulnerabilitySandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, SandboxJS blocks direct assignment to global objects (for example Math.random = ...), …EPSS 0.60%10.0CVE-2026-26954Nyariv sandboxjs code injection vulnerabilitySandboxJS is a JavaScript sandboxing library. Prior to 0.8.34, it is possible to obtain arrays containing Function, which allows escaping the sandbox…EPSS 0.60%10.0CVE-2026-25881Nyariv sandboxjs prototype pollution vulnerabilitySandboxJS is a JavaScript sandboxing library. Prior to 0.8.31, a sandbox escape vulnerability allows sandboxed code to mutate host built-in prototype…EPSS 0.64%10.0CVE-2026-25586Nyariv sandboxjs injection vulnerabilitySandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which di…EPSS 0.67%10.0CVE-2026-25587Nyariv sandboxjs code injection vulnerabilitySandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, as Map is in SAFE_PROTOYPES, it's prototype can be obtained via Map.prototype. By over…EPSS 0.67%10.0CVE-2026-25142Nyariv sandboxjs code injection vulnerabilitySandboxJS is a JavaScript sandboxing library. Prior to 0.8.27, SanboxJS does not properly restrict __lookupGetter__ which can be used to obtain proto…EPSS 1.1%10.0CVE-2026-23830Nyariv sandboxjs code injection vulnerabilitySandboxJS is a JavaScript sandboxing library. Versions prior to 0.8.26 have a sandbox escape vulnerability due to `AsyncFunction` not being isolated …EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2026-25520), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.