{"schema":"threatline.record/2","record":{"id":"GHSA-4q55-j62x-fr9h","aliases":["GHSA-4q55-j62x-fr9h"],"summary":"devalue: Malformed null-prototype object keys bypass __proto__ rejection via property-key coercion","details":"This is another instance of https://github.com/sveltejs/devalue/security/advisories/GHSA-mwv9-gp5h-frr4, where some payloads could cause `parse` to create objects with a `__proto__` own property. This on its own is not enough to cause prototype pollution, and indeed this is actually how `JSON.parse` works, but we decided to be a little more defensive here and not allow the creation of objects with `__proto__` own-properties. It is very unlikely for this to cause any issues.","categories":["Libraries & packages"],"product":"devalue","vendor":"","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-4q55-j62x-fr9h","source_modified_at":"2026-10-01T15:13:25Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"devalue"},"range":"<= 5.9.2"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-4q55-j62x-fr9h","source_modified_at":"2026-10-01T15:30:05.275097480Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"devalue","ecosystem":"npm","purl":"pkg:npm/devalue"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.9.3"}]}],"versions":[]}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/advisories/GHSA-4q55-j62x-fr9h","source_modified_at":"2026-10-01T15:13:25Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"ecosystem":"npm","name":"devalue"},"version":"5.9.3"},{"source":"OSV","source_url":"https://osv.dev/vulnerability/GHSA-4q55-j62x-fr9h","source_modified_at":"2026-10-01T15:30:05.275097480Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"devalue","ecosystem":"npm","purl":"pkg:npm/devalue"},"version":"5.9.3"}],"cvss":6.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-01T15:13:23Z","modified_at":"2026-10-01T15:30:05.275097480Z","provenance":[{"source":"GitHub Advisory Database","url":"https://github.com/advisories/GHSA-4q55-j62x-fr9h","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-01T15:13:25Z"},{"source":"OSV","url":"https://osv.dev/vulnerability/GHSA-4q55-j62x-fr9h","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-01T15:30:05.275097480Z"}],"sources":["GitHub Advisory Database","OSV"],"references":[{"url":"https://github.com/sveltejs/devalue/security/advisories/GHSA-4q55-j62x-fr9h","source":"GitHub Advisory Database"},{"url":"https://github.com/sveltejs/devalue/commit/9ec513072e31f45e60d44dad6f0dba9c92bb8675","source":"GitHub Advisory Database"},{"url":"https://github.com/sveltejs/devalue/releases/tag/v5.9.3","source":"GitHub Advisory Database"},{"url":"https://github.com/advisories/GHSA-4q55-j62x-fr9h","source":"GitHub Advisory Database"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"ecosystem","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-01T15:30:05.275097480Z","content_hash":"d7563e82d060c50582c96f181c9defd96f9a09af64a798b2be490b397ecfa968"}}