CVE-2026-25520 | THREATINT

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.

PUBLISHED Reserved 2026-02-02 | Published 2026-02-06 | Updated 2026-02-06 | Assigner GitHub_M

CRITICAL: 10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Problem types

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Product status

< 0.8.29

affected

References

github.com/...dboxJS/security/advisories/GHSA-58jh-xv4v-pcx4 exploit

github.com/...dboxJS/security/advisories/GHSA-58jh-xv4v-pcx4

github.com/...ommit/67cb186c41c78c51464f70405504e8ef0a6e43c3

cve.org (CVE-2026-25520)

nvd.nist.gov (CVE-2026-25520)

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