CVE-2026-56848
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...
- Published
- Aug 4, 2026
- Updated
- Aug 4, 2026
- Assigning CNA
- hackerone
- Evidence observed
- Aug 19, 2026
Primary CVSS
nvd · CVSS 3.0
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLow · next 30 days
- Percentile
- 40.8%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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**.
Sources
Exploit PoC for CVE-2026-56848, a Node.js HTTP/2 heap-use-after-free that allows remote unauthenticated DoS. Includes raw-socket trigger, ASan build instructions, and Docker-based target.
Responsible use
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