CVE-2026-123566
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Nov 08, 2026
Vendor
unknown
Description
Sveltejs devalue before 5.9.3 contains a denial of service vulnerability that allows attackers to cause CPU amplification by supplying sparse arrays to uneval. Attackers who influence sparse values passed to uneval can force synchronous work proportional to the declared array length, blocking the event loop.