Medium severity · published Mar 30, 2026
CVE-2026-21714
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…
5.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
node · nodejs
20.20.1 through 20.20.1; 22.22.1 through 22.22.1; 24.14.0 through 24.14.0; 25.8.1 through 25.8.1 · source: vendor
NO
Node.js · Nodejs
through 20.20.1; 22.0.0 through 22.22.1; 24.0.0 through 24.14.0; 25.0.0 through 25.8.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21714
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21714
Vendor Advisory
https://nodejs.org/en/blog/vulnerability/march-2026-security-releases
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