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.

While the V8 team does not classify this as a security vulnerability, the Node.js project considers it one due to its potential impact in real-world scenarios.
This vulnerability affects Node.js v24.x users.

Impact:
This vulnerability affects all users in active release lines: 24.x

NOTE: https://nodejs.org/en/blog/vulnerability/july-2025-security-releases#hashdos-in-v8-cve-2025-27209---high