What is CVE-2025-27209?

CVE-2025-27209 is a high-severity vulnerability in Nodejs Node. CVSS score: 7.5/10. Published 2025-07-18.

How severe is CVE-2025-27209?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-27209 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Nodejs Node

CVE-2025-27209

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 c…

EPSS: 0.001 (35.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Nodejs Node — versions 24.0.0

Public proof-of-concept exploits

References

nodejs.org/en/blog/vulnerability/july-2025-security-releases

Frequently asked questions

What is CVE-2025-27209?: CVE-2025-27209 is a high-severity vulnerability in Nodejs Node. CVSS score: 7.5/10. Published 2025-07-18.
How severe is CVE-2025-27209?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-27209 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.