CVE-2026-56848 [HIGH] – A flaw in Node.js HTTP/2 handling allows `nghttp2_session_mem_send()` to be called re-entr

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**.