HIGH 8.7 NVD
CVE-2026-123566
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.
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.
References
- https://github.com/sveltejs/devalue/security/advisories/GHSA-hx4r-w6wj-j8fg
- https://www.vulncheck.com/advisories/devalue-before-5.9.3-cpu-amplification-denial-of-serv
This high severity vulnerability with a CVSS score of 8.7 was published on 2026-11-08 via NVD.
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