CVE-2025-27209

7.5 highEPSS 1.3%

High (7.5). EPSS 1.3% 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.

Severity

CVSS 3.0

7.5 high

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 1.3% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-31)
CWE: CWE-407
Published: 2025-07-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

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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