CVE-2026-56846
Received Received - Intake

HTTP/2 Memory Exhaustion in Node.js

Publication date: 2026-08-04

Last updated on: 2026-08-04

Assigner: HackerOne

Description
A flaw in Node.js HTTP/2 handling can cause HTTP/2 retained header blocks evade maxSessionMemory and enable remote memory exhaustion. This vulnerability affects Node.js **24.x** and **22.x**.

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Meta Information

Published
2026-08-04
Last Modified
2026-08-04
Generated
2026-08-04
AI Q&A
2026-08-04
EPSS Evaluated
N/A
NVD
CVE-2026-56846
EUVD
EUVD-2026-52564

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
nodejs node.js From 24.x (inc)
nodejs node.js From 22.x (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

This vulnerability is a flaw in Node.js HTTP/2 handling that allows HTTP/2 retained header blocks to bypass maxSessionMemory limits. This can lead to remote memory exhaustion attacks.

Impact Analysis

An attacker could exploit this to consume excessive memory on a server running vulnerable Node.js versions, causing performance degradation or crashes.

Compliance Impact

This vulnerability could lead to remote memory exhaustion via HTTP/2 retained header blocks, potentially causing service disruption or crashes. Such instability may impact systems handling sensitive data, potentially violating compliance requirements for availability and integrity under standards like GDPR or HIPAA.

Mitigation Strategies

Upgrade Node.js to a patched version that addresses this HTTP/2 memory exhaustion flaw. Monitor memory usage on systems running Node.js 24.x or 22.x for signs of unusual consumption.

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