CVE-2026-25224

LOW EPSS 38.3%
Published Feb 3, 20265mo ago · Modified Jun 17, 20262w ago
3.7 CVSS 3.1
Low
Find Similar
Published Feb 3, 2026 5mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
3.7
Exploitability
2.2
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability Low

Threat Intelligence

EPSS Exploit Probability
38.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-770

Affected Products 1

VendorProductVersionRange
fastifyfastify* <5.7.3

References 3

  • github.com https://github.com/fastify/fastify/commit/eb11156396f6a5fedaceed0140aed2b7f026be37
    Patch
  • github.com https://github.com/fastify/fastify/security/advisories/GHSA-mrq3-vjjr-p77c
    Vendor Advisory
  • hackerone.com https://hackerone.com/reports/3524779
    Permissions Required

Remediation

  • github.com https://github.com/fastify/fastify/commit/eb11156396f6a5fedaceed0140aed2b7f026be37
    Patch