{"id":"GHSA-8qm3-746x-r74r","summary":"devalue `uneval`ed code can create objects with polluted prototypes when `eval`ed","details":"Under certain circumstances, `uneval`ing untrusted data can produce output code that will create objects with polluted prototypes when later `eval`ed, meaning the output data can be a different shape from the input data.","modified":"2026-02-19T21:25:36.354174Z","published":"2026-02-19T20:29:17Z","database_specific":{"github_reviewed_at":"2026-02-19T20:29:17Z","nvd_published_at":null,"cwe_ids":["CWE-1321"],"severity":"LOW","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-8qm3-746x-r74r"},{"type":"WEB","url":"https://github.com/sveltejs/devalue/commit/0f04d4d678eac39ad5d7a07d1956275d7874e81c"},{"type":"PACKAGE","url":"https://github.com/sveltejs/devalue"},{"type":"WEB","url":"https://github.com/sveltejs/devalue/releases/tag/v5.6.3"}],"affected":[{"package":{"name":"devalue","ecosystem":"npm","purl":"pkg:npm/devalue"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.6.3"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 5.6.2","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-8qm3-746x-r74r/GHSA-8qm3-746x-r74r.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N"}]}