MEDIUM 6.3 NVD
CVE-2026-123567
Sveltejs devalue before 5.6.4 contains a prototype injection vulnerability that allows attackers to inject __proto__ own properties into objects returned by dev
Sveltejs devalue before 5.6.4 contains a prototype injection vulnerability that allows attackers to inject __proto__ own properties into objects returned by devalue.parse and devalue.unflatten. Attackers can supply crafted serialized input that, when downstream code merges results via Object.assign, alters the target object's prototype.
References
- https://github.com/sveltejs/devalue/security/advisories/GHSA-mwv9-gp5h-frr4
- https://www.vulncheck.com/advisories/sveltejs-devalue-before-5.6.4-prototype-injection-via
This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-11-08 via NVD.
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