CVE-2026-21717 - Node.js V8 JSON.parse() String Hash Collision Vulnerability

CVE-2026-21717 - Node.js V8 JSON.parse() String Hash Collision Vulnerability

https://cvefeed.io/rssfeed/latest.atom / Tue, 03/31/2026 - 00:09
CVE ID :CVE-2026-21717
Published : March 30, 2026, 8:16 p.m. | 49 minutes ago
Description :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**.
Severity: 5.9 | MEDIUM
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