{"id":"GHSA-jp82-f5mq-hwhp","summary":"Seroval: Memory exhaustion via unchecked TypedArray length in JSON deserialization","details":"# Summary\n\ndeserializeTypedArray casts the source node to ArrayBuffer without checking it and never bounds the element count. Pass a plain object with a length property and it hits the array-like TypedArray constructor, allocating that many elements. The offset guard above it can't stop this: source.byteLength is undefined, so the comparison is always false.\n\nThe length is one integer in the JSON, so a tiny payload can name any allocation size, and it runs synchronously inside fromJSON, starving the event loop instead of just slowing one request. fromCrossJSON is the same.\n\nImpact is unauthenticated CPU/memory exhaustion for any service deserializing untrusted Seroval JSON: same profile as the array-length and nested-depth DoS issues already fixed here. No confidentiality or integrity impact. DataView has the same unchecked cast but throws instead of allocating. A runtime instanceof ArrayBuffer check plus a size cap should fix it.","aliases":["CVE-2026-104845"],"modified":"2026-10-05T23:45:07.431923537Z","published":"2026-10-05T23:40:40Z","database_specific":{"nvd_published_at":"2026-10-02T16:16:47Z","cwe_ids":["CWE-770"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-10-05T23:40:40Z"},"references":[{"type":"WEB","url":"https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-jp82-f5mq-hwhp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104845"},{"type":"WEB","url":"https://github.com/lxsmnsyc/seroval/commit/ac0163e420ac7dcbbefac4d069bcefad300a4851"},{"type":"WEB","url":"https://github.com/lxsmnsyc/seroval/commit/e54a6f62784b9e48e3a5fa2ab4089ca69fb8996e"},{"type":"PACKAGE","url":"https://github.com/lxsmnsyc/seroval"}],"affected":[{"package":{"name":"seroval","ecosystem":"npm","purl":"pkg:npm/seroval"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.6.3"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 1.6.2","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-jp82-f5mq-hwhp/GHSA-jp82-f5mq-hwhp.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}