{"id":"CVE-2026-123561","published":"2026-11-08T02:16:48.400","lastModified":"2026-11-10T18:17:25.670","description":"devalue before 5.9.3 allows malformed null-prototype object keys to bypass parse's __proto__ rejection through property-key coercion, an incomplete fix for GHSA-mwv9-gp5h-frr4. Attackers can supply crafted payloads that yield objects with a __proto__ own property, which alone does not cause prototype pollution.","cvssScore":3.7,"cvssSeverity":"LOW","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","cwes":["CWE-1321"],"vendors":[],"products":[],"references":[{"url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-4q55-j62x-fr9h","tags":[]},{"url":"https://www.vulncheck.com/advisories/sveltejs-devalue-before-5.9.3-proto-rejection-bypass-via-property-key-coercion","tags":[]}],"exploitRefs":[{"url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-4q55-j62x-fr9h","tags":[]}],"hasPoc":true,"ai":null}