Node.js HTTP/2 Header Block Memory Exhaustion (CVE-2026-56846)
CVE-2026-56846 Published on August 4, 2026
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**.
Weakness Type
What is a Resource Exhaustion Vulnerability?
The software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
CVE-2026-56846 has been classified to as a Resource Exhaustion vulnerability or weakness.
Affected Versions
nodejs node:- Version 24.18.0, <= 24.18.0 is affected.
- Version 22.23.1, <= 22.23.1 is affected.