CVE-2025-27209

State: Published
Severity: 7.5 High
Published: Jul 18, 2025
Updated: Nov 4, 2025
Reserved: Feb 20, 2025

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.

Scores

CVSS	Score	Vector	Source
3.0	7.5 High	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	hackerone

Weaknesses

CWE-407 Inefficient Algorithmic Complexity

Affected Products

Product	Versions
nodenodejs	24.0.0 to before 24.4.1Affected

References

https://nodejs.org/en/blog/vulnerability/july-2025-security-releases
http://www.openwall.com/lists/oss-security/2025/07/22/2

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