CVE-2026-21714 | BDVDB-2026-323690 Detail

nodejsnode

Description#

A memory leak occurs in Node.js HTTP/2 servers when a client sends WINDOW_UPDATE frames on stream 0 (connection-level) that cause the flow control window to exceed the maximum value of 2³¹-1. The server correctly sends a GOAWAY frame, but the Http2Session object is never cleaned up. This vulnerability affects HTTP2 users on Node.js 20, 22, 24 and 25.

Impact#

Per CVSS v3.0: confidentiality impact none, integrity impact none, availability impact low. Attack vector: network.

Weaknesses#

CWE-401 Missing Release of Memory after Effective Lifetime

References#

https://nodejs.org/en/blog/vulnerability/march-2026-security-releases

Exploit#

No public exploit known

History#

Version 12026-03-30Record published in the CVE List.
Version 22026-03-31Most recent update recorded in the CVE List.

Published

Published: 2026-03-30
Last modified: 2026-03-31

Vendor information

Vendor: nodejs
Product: node

All nodejs vulnerabilities

Score

5.3 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 37.7.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 20.20.1 and <= 20.20.1
Fixed
Not stated
Vulnerable
>= 22.22.1 and <= 22.22.1
Fixed
Not stated
Vulnerable
>= 24.14.0 and <= 24.14.0
Fixed
Not stated
Vulnerable
>= 25.8.1 and <= 25.8.1
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

Not available

CVSS v3.0

5.3 Medium

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	None
Integrity	None
Availability	Low

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).