CVE-2026-21717 in Node.js

Zusammenfassung (Englisch)

A flaw in V8's string hashing mechanism causes integer-like strings to be hashed to their numeric value, making hash collisions trivially predictable. By crafting a request that causes many such collisions in V8's internal string table, an attacker can significantly degrade performance of the Node.js process. The most common trigger is any endpoint that calls `JSON.parse()` on attacker-controlled input, as JSON parsing automatically internalizes short strings into the affected hash table. This vulnerability affects **20.x, 22.x, 24.x, and 25.x**.

Veröffentlichung

30.03.2026

Einträge

VulDB provides additional information and datapoints for this CVE:

ID	Schwachstelle	CWE	Aus	Mas	CVE
354148	Node.js V8 Handler JSON.parse Denial of Service	404	Nicht definiert	Offizieller Fix	CVE-2026-21717