Use-After-Free in Node.js HTTP/2 handling (CVE-2026-56848)
Summary
Vulnerability in Node.js HTTP/2 handling (CVE-2026-56848). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
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.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-56848 has been found in Node.js HTTP/2 handling.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Node.js HTTP/2 handling CVE-2026-56848" on the vendor's site.
CVE-2026-56848 (Node.js HTTP/2 handling) — CWE-416 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Use-after-free (CWE-416) exists in Node.js HTTP/2 handling.
Check the vendor advisory for the affected versions of Node.js HTTP/2 handling.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Node.js HTTP/2 handling を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Alpine Linux ALPINE-CVE-2026-56848 nodejs Fixed in: 22.23.2-r0
- BellSoft Alpaquita BELL-CVE-2026-56848 nodejs Fixed in: 22.23.2-r0
- Debian DEBIAN-CVE-2026-56848 nodejs Fixed in: 18.20.4+dfsg-1~deb12u3
- Ubuntu UBUNTU-CVE-2026-56848 nodejs
References
- web nvd.nist.gov
- web nodejs.org
- web github.com