Use-after-free in Node.js - CVE-2026-56848
Published: July 29, 2026 / Updated: July 29, 2026
Vulnerability identifier: #VU140039
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-56848
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
Node.js
Node.js
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service or potentially execute arbitrary code.
The vulnerability exists due to use-after-free in Node.js HTTP/2 handling when nghttp2_session_mem_send() is called re-entrantly while nghttp2_session_mem_recv() is executing. A remote attacker can trigger re-entrant HTTP/2 processing to cause a denial of service or potentially execute arbitrary code.
How to mitigate CVE-2026-56848
Install security update from vendor's website.