{"id":"CVE-2026-116581","aliases":["GHSA-97r2-qh9m-474h"],"title":"Seroval: fromJSON deserializer trusts node-supplied array length and sequence doneAt (unauthenticated event-loop DoS)","summary":"Seroval: fromJSON deserializer trusts node-supplied array length and sequence doneAt (unauthenticated event-loop DoS)","severity":"high","cvss":7.5,"cwe":["CWE-835","CWE-1284"],"vendor":"seroval","product":"seroval","ecosystem":"npm","affected":["seroval <= 1.6.7"],"patched":["seroval 1.6.8"],"published":"2026-10-28","updated":"2026-10-28","sourceUpdated":"2026-10-28T21:17:28Z","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-97r2-qh9m-474h","references":[{"url":"https://github.com/lxsmnsyc/seroval/security/advisories/GHSA-97r2-qh9m-474h"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116581"},{"url":"https://github.com/lxsmnsyc/seroval/commit/cdcee3e3bc384ee844360844f8ea98fd2b275d69"},{"url":"https://github.com/lxsmnsyc/seroval/commit/e176f9267e59ddd6c9de89cc9fe85c5b37a5b728"},{"url":"https://github.com/lxsmnsyc/seroval/releases/tag/seroval@1.6.8"},{"url":"https://github.com/advisories/GHSA-97r2-qh9m-474h"}],"tags":["ghsa","npm","cve.org"],"epss":0.00451,"epssPercentile":0.39075,"ingestedAt":"2026-10-27T16:11:59.027Z","slug":"CVE-2026-116581","body":"## Overview\n\n### 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.\n\n## Affected packages\n\n- `seroval <= 1.6.7`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `seroval 1.6.8`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}