CVE-2026-56848 Use after free in node
A heap-use-after-free in Node.js HTTP/2 handling allows attackers to execute arbitrary code or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56848?
CVE-2026-56848 is a high-severity use after free 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 allows `nghttp2_session_mem_send()` to be called re-entrantly while `nghttp2_session_mem_recv()` is executing, resulting in a heap-use-after-free. This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.
Weakness: CWE-416
Which versions are affected by CVE-2026-56848?
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, 26.5.1 |
node-min Bitnami | All versions | 22.23.2, 24.18.1, 26.5.1 |
How do I fix CVE-2026-56848?
Upgrade node to a fixed version for your release line: 22.23.2, 24.18.1 or 26.5.1.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-56848 being exploited?
There is no known exploitation of CVE-2026-56848 in the wild and no public exploit code.
Public exploit code: 2 proofs of concept on GitHub.
Sources
Also known as ALPINE-CVE-2026-56848, BELL-CVE-2026-56848, BIT-node-2026-56848, BIT-node-min-2026-56848, CLEANSTART-2026-AL35198, DEBIAN-CVE-2026-56848 and 11 more.