What is CVE-2026-56846?

CVE-2026-56846 is a high-severity vulnerability in Nodejs Node, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-08-04.

How severe is CVE-2026-56846?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Nodejs Node

CVE-2026-56846

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**.

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Nodejs Node — versions 24.18.0, 22.23.1

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

support@hackerone.com

Frequently asked questions

What is CVE-2026-56846?: CVE-2026-56846 is a high-severity vulnerability in Nodejs Node, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-08-04.
How severe is CVE-2026-56846?: High severity. CVSS v3 base score is 7.5 out of 10.