CVE-2025-27209

Node.js: Inefficient Algorithmic Complexity

CVE-2025-27209 is fixed in Node.js on 1 platform by Node.js 24.4.1 (version 24.4.1), released July 15, 2025. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

No vendor severity

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0125

69th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
Node.js	24.4.1	Node.js 24.4.1	Jul 15, 2025

Details

Published
July 18, 2025
Weakness
CWE-407: Inefficient Algorithmic Complexity
Vendor advisory
https://nvd.nist.gov/vuln/detail/CVE-2025-27209

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