# CVE-2026-25520

## Summary

- **CVE ID:** CVE-2026-25520
- **Severity:** CRITICAL
- **CVSS Score:** 10 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
- **CWE:** CWE-74
- **Published:** Feb 6, 2026
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- nyariv — SandboxJS (< 0.8.29)

## References

- [CNA](https://github.com/nyariv/SandboxJS/security/advisories/GHSA-58jh-xv4v-pcx4)
- [CNA](https://github.com/nyariv/SandboxJS/commit/67cb186c41c78c51464f70405504e8ef0a6e43c3)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.80%
- **EPSS Percentile:** 54.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._