CVE-2025-27209
Node.js V8 HashDoS Vulnerability
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.
INFO
Published Date :
July 18, 2025, 11:15 p.m.
Last Modified :
July 22, 2025, 1:06 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2025-27209 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-27209.
| URL | Resource |
|---|---|
| https://nodejs.org/en/blog/vulnerability/july-2025-security-releases |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-27209 vulnerability anywhere in the article.
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CybersecurityNews
Weekly Cybersecurity Newsletter: Chrome 0-Day, VMware Flaws Patched, Fortiweb Hack, Teams Abuse, and More
It’s been a busy seven days for security alerts. Google is addressing another actively exploited zero-day in Chrome, and VMware has rolled out key patches for its own set of vulnerabilities. We’ll als ... Read more
The following table lists the changes that have been made to the
CVE-2025-27209 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 21, 2025
Action Type Old Value New Value Added CWE CWE-407 -
New CVE Received by [email protected]
Jul. 18, 2025
Action Type Old Value New Value Added 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. Added CVSS V3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added Reference https://nodejs.org/en/blog/vulnerability/july-2025-security-releases
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-27209 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-27209
weaknesses.