CVE-2025-27209: Node.js Node

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

The V8 release used in Node.js v24.0.0 has changed how string hashes are computed using rapidhash. This implementation re-introduces the HashDoS vulnerability as an attacker who can control the strings to be hashed can generate many hash collisions - an attacker can generate collisions even without knowing the hash-seed. * This vulnerability affects Node.js v24.x users.

Affected products

• Node.js Node: from 24.0.0, before 24.4.1 (fixed in 24.4.1)

Published 2025-07-18. Last modified 2026-06-17.