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 heap-use-after-free.
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.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-56848
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-56848 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- medium[NEW] [medium] Node.js: Multiple vulnerabilitiescert-bund
- unknownNode.js Multiple Vulnerabilitieshkcert
- unknownMultiple Vulnerabilities in Node.js (July 30, 2026)cert-fr-avis
Recent advisories for Node.js HTTP/2 handling
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
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