Is CVE-2026-56848 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-56848?

CVE-2026-56848 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-56848

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**.