CVE-2026-25520

critical · 10

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

0.8%

EPSS (exploit prob.)

55th

EPSS percentile

2026-02-06

Published

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

Weaknesses

CWE-74

Affected products

Vendor	Product	Affected versions
nyariv	sandboxjs	< 0.8.29

Check a specific version with /api/v1/cve/match.

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-25520