{"id":"GHSA-mcm9-63f2-9j32","summary":"devalue: Repeated primitive strings cause quadratic expansion in uneval","details":"Under very constrained circumstances, data that was `parse`d and then passed to `uneval` could turn a small payload into a very large serialized string.","modified":"2026-10-01T15:30:12.676095253Z","published":"2026-10-01T15:17:29Z","database_specific":{"cwe_ids":["CWE-400","CWE-409"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-10-01T15:17:29Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-mcm9-63f2-9j32"},{"type":"WEB","url":"https://github.com/sveltejs/devalue/commit/84f6f67999104e36940f744bec0443536de1b463"},{"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-mcm9-63f2-9j32/GHSA-mcm9-63f2-9j32.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:H/SC:N/SI:N/SA:N"}]}