CVE-2026-56848: CWE-416 Use After Free in nodejs node
CVE-2026-56848 is a high-severity use-after-free vulnerability in Node.js HTTP/2 handling. It occurs when the function nghttp2_session_mem_send() is called re-entrantly during the execution of nghttp2_session_mem_recv(), leading to a heap-use-after-free condition. This flaw affects specific Node.js versions 26.5.0, 24.18.0, and 22.23.1. The vulnerability does not impact confidentiality or integrity but can cause denial of service due to application crashes. There is no confirmed patch or official remediation available at this time.
AI Analysis
Technical Summary
This vulnerability in Node.js arises from improper handling of HTTP/2 sessions where nghttp2_session_mem_send() can be invoked re-entrantly while nghttp2_session_mem_recv() is still executing. This results in a heap-use-after-free condition (CWE-416), which can lead to application instability or crashes. The affected versions are specifically Node.js 26.5.0, 24.18.0, and 22.23.1. The CVSS v3.0 score is 7.5, indicating high severity with network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.
Potential Impact
The primary impact of this vulnerability is a potential denial of service caused by heap-use-after-free, which may crash the Node.js process handling HTTP/2 connections. There is no indication of confidentiality or integrity compromise. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch links are provided, users should monitor Node.js security advisories for updates. Until a patch is available, consider limiting exposure of affected Node.js versions to untrusted networks or disabling HTTP/2 if feasible.
CVE-2026-56848: CWE-416 Use After Free in nodejs node
Description
CVE-2026-56848 is a high-severity use-after-free vulnerability in Node.js HTTP/2 handling. It occurs when the function nghttp2_session_mem_send() is called re-entrantly during the execution of nghttp2_session_mem_recv(), leading to a heap-use-after-free condition. This flaw affects specific Node.js versions 26.5.0, 24.18.0, and 22.23.1. The vulnerability does not impact confidentiality or integrity but can cause denial of service due to application crashes. There is no confirmed patch or official remediation available at this time.
CVSS v3.0
Score 7.5high
Affected software
nodejs
node
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Node.js arises from improper handling of HTTP/2 sessions where nghttp2_session_mem_send() can be invoked re-entrantly while nghttp2_session_mem_recv() is still executing. This results in a heap-use-after-free condition (CWE-416), which can lead to application instability or crashes. The affected versions are specifically Node.js 26.5.0, 24.18.0, and 22.23.1. The CVSS v3.0 score is 7.5, indicating high severity with network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability.
Potential Impact
The primary impact of this vulnerability is a potential denial of service caused by heap-use-after-free, which may crash the Node.js process handling HTTP/2 connections. There is no indication of confidentiality or integrity compromise. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or patch links are provided, users should monitor Node.js security advisories for updates. Until a patch is available, consider limiting exposure of affected Node.js versions to untrusted networks or disabling HTTP/2 if feasible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- hackerone
- Date Reserved
- 2026-06-23T15:00:03.632Z
- Cvss Version
- 3.0
- State
- PUBLISHED
Threat ID: 6a72133ebf8831d5391ad47a
Added to database: 08/04/2026, 16:28:46 UTC
Last enriched: 08/11/2026, 18:17:06 UTC
Last updated: 09/20/2026, 00:18:47 UTC
Views: 54
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