Improper Handling of Length Parameter Inconsistency Affecting seroval package, versions >=1.4.1 <1.6.8
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-SEROVAL-21755420
- published27 Oct 2026
- disclosed26 Oct 2026
- creditMark Anthony Llego
Introduced: 26 Oct 2026
NewCVE-2026-116584 (opens in a new tab)How to fix?
Upgrade seroval to version 1.6.8 or higher.
Overview
seroval is a Stringify JS values
Affected versions of this package are vulnerable to Improper Handling of Length Parameter Inconsistency via the fromJSON/fromCrossJSON deserialization path in deserializer.ts, where a node's element list is not validated to be a real array before use. An attacker can supply a payload containing an array-like object (e.g. {"length": 1000000000} or {"length": "Infinity"}) in place of a genuine element list for arrays, object/record properties, Set, Map, StreamConstructor, or Sequence nodes. Because the length property drives allocation and iteration with no matching data on the wire, a tiny payload forces unbounded memory allocation and work, crashing the process.