High severity7.5NVD Advisory· Published Jul 18, 2025· Updated Apr 15, 2026

CVE-2025-27209

Description

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.

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

www.openwall.com/lists/oss-security/2025/07/22/2nvd
nodejs.org/en/blog/vulnerability/july-2025-security-releasesnvd

News mentions

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