7.5

CVE-2025-27209: nodejs node Inefficient Algorithmic Complexity

CVSS: 7.5v3.0HighDeferred
Published 18-07-2025Last modified 04-11-2025
Open JSON

Vulnerability summary

CVE-2025-27209 is a high (CVSS 7.5) Inefficient Algorithmic Complexity vulnerability in nodejs node. EPSS estimates a 1.25% chance of exploitation in the next 30 days, higher than 69% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.0 (CVE.org)
EPSS score
1.25%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 18-07-2025
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

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 metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

1.25%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

+0.04 pp

From 1.21% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.25%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Nodejs1 product
  • node≥ 24.0.0, < 24.4.1

1 vendor · 1 product

References

2 links