CVE-2026-56848: CWE-416 Use After Free in nodejs node
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**.
AI Analysis
Technical Summary
CVE-2026-56848 is a use-after-free vulnerability (CWE-416) in Node.js related to HTTP/2 protocol handling. The flaw occurs because nghttp2_session_mem_send() can be invoked re-entrantly while nghttp2_session_mem_recv() is still executing, causing heap memory to be accessed after it has been freed. This issue affects Node.js versions 26.5.0, 24.18.0, and 22.23.1. The CVSS v3.0 base score is 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating network attack vector, low complexity, no privileges or user interaction required, unchanged scope, no confidentiality or integrity impact, but high impact on availability.
Potential Impact
The vulnerability can lead to a heap-use-after-free condition causing potential crashes or denial of service in affected Node.js HTTP/2 services. There is no reported impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the official Node.js vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented in the provided data. Users should monitor vendor communications for updates and apply patches once available.
CVE-2026-56848: CWE-416 Use After Free in nodejs node
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**.
CVSS v3.0
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-56848 is a use-after-free vulnerability (CWE-416) in Node.js related to HTTP/2 protocol handling. The flaw occurs because nghttp2_session_mem_send() can be invoked re-entrantly while nghttp2_session_mem_recv() is still executing, causing heap memory to be accessed after it has been freed. This issue affects Node.js versions 26.5.0, 24.18.0, and 22.23.1. The CVSS v3.0 base score is 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating network attack vector, low complexity, no privileges or user interaction required, unchanged scope, no confidentiality or integrity impact, but high impact on availability.
Potential Impact
The vulnerability can lead to a heap-use-after-free condition causing potential crashes or denial of service in affected Node.js HTTP/2 services. There is no reported impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the official Node.js vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented in the provided data. Users should monitor vendor communications for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- hackerone
- Date Reserved
- 2026-06-23T15:00:03.632Z
- Cvss Version
- 3.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a72133ebf8831d5391ad47a
Added to database: 08/04/2026, 16:28:46 UTC
Last enriched: 08/04/2026, 16:45:32 UTC
Last updated: 08/04/2026, 17:57:19 UTC
Views: 16
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