CVE-2026-21717 | BDVDB-2026-323693 Detail

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**.

Impact#

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Exploit#

History#

1. Version 12026-03-30Record published in the CVE List.
2. Version 22026-05-10Most recent update recorded in the CVE List.