CVE-2026-56848CWE-416

CVE-2026-56848

High · published August 4, 2026

CVSS v3.0
7.5
EPSS
0%
Percentile
41.2
In the wild
Unconfirmed
What it is

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**.

The record
Technical detail
CVSS v3.0
7.5 · HIGH
Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00490 · 41.2th percentile
Weakness
CWE-416 · Use After Free
Published
2026-08-04T21:16Z
References (1)
https://nodejs.org/en/blog/vulnerability/july-2026-security-releases · [email protected]
EPSS history
Timeline
  • 04 AUG 15:57Z
    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…
    cvelistv5