CVE-2026-43898

critical · 10

SandboxJS is a JavaScript sandboxing library. Prior to 0.9.6, sandbox-defined functions expose Function.caller, allowing sandboxed code to recover the internal LispType.Call runtime callback. That callback can then be invoked with attacker-controlled fake context and obj values to extract blocked host statics, recover the real host Function constructor, and execute arbitrary host JavaScript. This vulnerability is fixed in 0.9.6.

CVSS

0.5%

EPSS (exploit prob.)

40th

EPSS percentile

2026-05-28

Published

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

Weaknesses

CWE-94

Affected products

Vendor	Product	Affected versions
nyariv	sandboxjs	< 0.9.6

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

References

https://github.com/nyariv/SandboxJS/commit/826865251232611ec94078bab5a18ec875dad4a5
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-g8f2-4f4f-5jqw

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-43898