CVE-2026-56848

Summary

The flaw in Node.js HTTP/2 handling can lead to a heap-use-after-free condition when `nghttp2_session_mem_send()` is called re-entrantly while `nghttp2_session_mem_recv()` is executing, which could allow attackers to crash the application or execute arbitrary code.

Exploitability

Exploiting this vulnerability requires specific conditions and knowledge of the affected Node.js versions. It is moderately difficult due to the need for precise timing and control over HTTP/2 requests.

Blast radius

If exploited, this could result in a denial of service or potentially lead to arbitrary code execution on vulnerable systems running affected Node.js versions.

Prioritized remediation

Upgrade to a non-vulnerable version of Node.js as soon as possible.

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.