{"id":"CVE-2026-116581","aliases":["GHSA-97r2-qh9m-474h"],"url":"https://o3.security/vulnerability/CVE-2026-116581","summary":"Seroval: fromJSON deserializer trusts sequence doneAt (unauthenticated event-loop DoS)","details":"### Summary\n\n`fromJSON` and `fromCrossJSON` used two node fields without checking them.\n\n- An array node's element list was not checked to be an array. A small payload could set the length the decoder looped over. This part is also tracked in GHSA-wp97-x4hv-qvhp.\n- A sequence node's done index was not checked. A crafted value produced an iterator that never finished.\n\n### Impact\n\nA service that passes untrusted input to `fromJSON` or `fromCrossJSON` can be made unavailable by an unauthenticated request.\n\n- The array case blocks the thread while the decoder runs.\n- The sequence case makes any code that reads the resulting iterator to the end run forever.\n\n### Patches\n\nFixed in `seroval@1.6.8`.\n\n- Element lists must be arrays.\n- A sequence node's throw and done indices must be integers from -1 up to the last element index.\n\nInvalid input throws `SerovalMalformedNodeError`.\n\n### Workarounds\n\nNone. Upgrade to 1.6.8.","published":"2026-10-26T20:41:52.905Z","modified":"2026-10-28T02:59:29.537965070Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"seroval","fixedVersion":"1.6.8"}],"fix":{"url":"https://github.com/lxsmnsyc/seroval/commit/e176f9267e59ddd6c9de89cc9fe85c5b37a5b728","label":"lxsmnsyc/seroval@e176f92"},"references":[{"type":"WEB","url":"https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116581.json"},{"type":"ADVISORY","url":"https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-97r2-qh9m-474h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116581"},{"type":"FIX","url":"https://github.com/lxsmnsyc/seroval/commit/e176f9267e59ddd6c9de89cc9fe85c5b37a5b728"},{"type":"WEB","url":"https://github.com/lxsmnsyc/seroval/commit/cdcee3e3bc384ee844360844f8ea98fd2b275d69"},{"type":"PACKAGE","url":"https://github.com/lxsmnsyc/seroval"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:59:29.537965070Z"}}