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7.5 High

CVE-2026-56848 A flaw in Node.js HTTP/2 handling allows `nghttp2_session_mem_send()` to be called re-entrantly while…

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**.

Affected products and versions

Product Affected versions Fixed in
Node 26.5.0 No fix stated
Node 24.18.0 No fix stated
Node 22.23.1 No fix stated

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