CVE-2026-25586

critical · 10

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.29, a sandbox escape is possible by shadowing hasOwnProperty on a sandbox object, which disables prototype whitelist enforcement in the property-access path. This permits direct access to __proto__ and other blocked prototype properties, enabling host Object.prototype pollution and persistent cross-sandbox impact. This vulnerability is fixed in 0.8.29.

CVSS

0.6%

EPSS (exploit prob.)

50th

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-jjpw-65fv-8g48
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-jjpw-65fv-8g48

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-25586