High severity · published Jul 18, 2025
CVE-2025-27209
The V8 release used in Node.js v24.0.0 has changed how string hashes are computed using rapidhash
7.5
CVSS
1.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 69% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
node · nodejs
24.0.0 before 24.4.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-27209
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-27209
nodejs.org
https://nodejs.org/en/blog/vulnerability/july-2025-security-releases
www.openwall.com
http://www.openwall.com/lists/oss-security/2025/07/22/2
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