CVE-2026-56848: Node.js Node

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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**.

Affected products

• Node.js Node: from 26, up to and including 26.5.0; from 24, up to and including 24.18.0; from 22, up to and including 22.23.1

Published 2026-08-04. Last modified 2026-09-03.