{"id":"GHSA-hx4r-w6wj-j8fg","summary":"devalue: Residual sparse-array CPU amplification in uneval","details":"`uneval` performs synchronous work proportional to a sparse array's declared length. An application that passes attacker-influenced sparse values to `uneval` can suffer event-loop blocking. Since attacker-controlled creation of sparse arrays is so difficult, this vulnerability is very difficult to exploit.","modified":"2026-10-01T15:30:12.679856219Z","published":"2026-10-01T15:17:42Z","database_specific":{"github_reviewed_at":"2026-10-01T15:17:42Z","nvd_published_at":null,"cwe_ids":["CWE-400","CWE-407"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-hx4r-w6wj-j8fg"},{"type":"WEB","url":"https://github.com/sveltejs/devalue/commit/6861dbbb7e548849e48bce718e88747a298f7250"},{"type":"PACKAGE","url":"https://github.com/sveltejs/devalue"},{"type":"WEB","url":"https://github.com/sveltejs/devalue/releases/tag/v5.9.3"}],"affected":[{"package":{"name":"devalue","ecosystem":"npm","purl":"pkg:npm/devalue"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.9.3"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 5.9.2","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-hx4r-w6wj-j8fg/GHSA-hx4r-w6wj-j8fg.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}