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Node.js EUVDEUVD-2026-17176

| CVE-2026-21714 MEDIUM
Memory Leak (CWE-401)
2026-03-30 hackerone
Node.js Information Disclosure Red Hat
5.3
CVSS 3.0 · NVD
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Severity by source

NVD PRIMARY
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Ubuntu
MEDIUM
qualitative
SUSE
5.9 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.3 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 30, 2026 - 19:30 euvd
EUVD-2026-17176
Analysis Generated
Mar 30, 2026 - 19:30 vuln.today
CVE Published
Mar 30, 2026 - 19:07 nvd
MEDIUM 5.3

DescriptionCVE.org

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.

AnalysisAI

Memory leak in Node.js HTTP/2 servers allows remote unauthenticated attackers to exhaust server memory by sending crafted WINDOW_UPDATE frames on stream 0 that exceed the maximum flow control window value. Affected versions include Node.js 20, 22, 24, and 25. While the server correctly responds with a GOAWAY frame, the Http2Session object fails to be cleaned up, leading to denial of service through resource exhaustion. No public exploit code identified at time of analysis.

Technical ContextAI

The vulnerability resides in Node.js HTTP/2 protocol handling, specifically in the flow control window management mechanism. HTTP/2 maintains per-stream and connection-level flow control windows with a maximum value of 2³¹-1 (2,147,483,647 bytes). When a client sends a WINDOW_UPDATE frame on stream 0 (the connection-level pseudo-stream) that causes the flow control window to overflow beyond this maximum, the server generates an appropriate GOAWAY frame to terminate the connection. However, the cleanup logic for the Http2Session object-which maintains state for the entire HTTP/2 connection-fails to execute, leaving session resources allocated in memory. Affected CPE: cpe:2.3:a:nodejs:node:*:*:*:*:*:*:*:* across versions 20, 22, 24, and 25.

RemediationAI

Upgrade to the patched versions of Node.js released in March 2026 as documented in the official Node.js security advisory at https://nodejs.org/en/blog/vulnerability/march-2026-security-releases. Specific patch versions should be obtained from that advisory or from Debian advisory DSA-6183-1 for Debian-based systems. Until patching is feasible, implement monitoring for HTTP/2 connection memory usage and configure automatic process restart policies to limit the duration and severity of memory exhaustion. Additionally, if possible, restrict HTTP/2 access to trusted client networks or implement rate limiting on WINDOW_UPDATE frames at a load balancer or reverse proxy level to reduce the rate at which the vulnerability can be triggered.

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Same weakness CWE-401 – Memory Leak

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Vendor StatusVendor

Ubuntu

Priority: Medium
nodejs
Release Status Version
trusty needs-triage -
xenial needs-triage -
bionic needs-triage -
focal needs-triage -
jammy needs-triage -
noble needs-triage -
questing needs-triage -
upstream released 22.22.2+dfsg+~cs22.19.15-1

Debian

nodejs
Release Status Fixed Version Urgency
bullseye vulnerable 12.22.12~dfsg-1~deb11u4 -
bullseye (security) vulnerable 12.22.12~dfsg-1~deb11u7 -
bookworm, bookworm (security) vulnerable 18.20.4+dfsg-1~deb12u1 -
trixie fixed 20.19.2+dfsg-1+deb13u2 -
trixie (security) fixed 20.19.2+dfsg-1+deb13u2 -
forky vulnerable 22.22.1+dfsg+~cs22.19.15-1 -
sid fixed 22.22.2+dfsg+~cs22.19.15-1 -
(unstable) fixed 22.22.2+dfsg+~cs22.19.15-1 -
DSA-6183-1

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise High Performance Computing 12 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Fixed
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Fixed

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EUVD-2026-17176 vulnerability details – vuln.today
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