CVE-2026-56848

Description

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**.

Overview

State: PUBLISHED
Assigner (CNA): hackerone
CVSS severity: HIGH
CVSS score: 7.5 / 10
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Effective score: 7.5 / 10 HIGH source: CNA overview
CWE(s): CWE-416
Reserved: 2026-06-23
Published: 2026-08-04 15:57 UTC
Last updated: 2026-08-04 17:36 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/56xxx/CVE-2026-56848.json
Linked Threat: CVE-2026-56848 — CVE-2026-56848

Affected products (1)

Vendor	Product	Versions	Platforms
nodejs	node	`26.5.0` (affected), `24.18.0` (affected), `22.23.1` (affected)	—

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://nodejs.org/en/blog/vulnerability/july-2026-security-releases

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-56848.json.

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                "role": "CISA Coordinator",
                "timestamp": "2026-08-04T17:35:44.952267Z",
                "version": "2.0.3"
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