CVE-2026-56846 Denial of service in node
Remote attackers can exhaust server memory via HTTP/2 header manipulation, causing denial of service in Node.js applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56846?
CVE-2026-56846 is a high-severity denial of service vulnerability in nodejs node, published on 4 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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**.
Weakness: CWE-400
Which versions are affected by CVE-2026-56846?
2 open source packages ship an affected version, including node and node-min.
| Package | Affected | Fixed in |
|---|---|---|
node Bitnami | All versions | 22.23.2, 24.18.1 |
node-min Bitnami | All versions | 22.23.2, 24.18.1 |
How do I fix CVE-2026-56846?
Upgrade node to a fixed version for your release line: 22.23.2 or 24.18.1.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-56846 being exploited?
There is no known exploitation of CVE-2026-56846 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as ALPINE-CVE-2026-56846, BELL-CVE-2026-56846, BIT-node-2026-56846, BIT-node-min-2026-56846, DEBIAN-CVE-2026-56846, ECHO-49f1-be71-d1b8 and 8 more.