3.7

CVE-2026-25224: fastify

CVSS: 3.7v3.1LowAnalyzed
AliasesGHSA-mrq3-vjjr-p77c
Published 03-02-2026Last modified 04-02-2026
Open JSON

Vulnerability summary

CVE-2026-25224 is a low (CVSS 3.7) vulnerability in fastify. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 45.1% of scored vulnerabilities.

Overall risk
15/100
0100
Low · default modelHow is this calculated?
CVSS score
3.7/10
010
Low · v3.1 (CVE.org)
EPSS score
0.55%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 03-02-2026
    PublishedVulnerability first disclosed.
  2. 04-02-2026
    Last modifiedVulnerability information updated.

Description

Fastify is a fast and low overhead web framework, for Node.js. Prior to version 5.7.3, a denial-of-service vulnerability in Fastify’s Web Streams response handling can allow a remote client to exhaust server memory. Applications that return a ReadableStream (or Response with a Web Stream body) via reply.send() are impacted. A slow or non-reading client can trigger unbounded buffering when backpressure is ignored, leading to process crashes or severe degradation. This issue has been patched in version 5.7.3.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

+0.05 pp

From 0.51% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.55%

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

Fastify1 product
Npm1 product
  • fastify< 5.7.3

2 vendors · 2 products

References

5 links