Vulnerability in react-server-dom-parcel (CVE-2026-23870)
Summary
Vulnerability in react-server-dom-parcel (CVE-2026-23870). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 19.2.6 or later.
Original description
The description as published by the source.
A denial of service vulnerability could be triggered by sending specially crafted HTTP requests to server function endpoints, this could lead to server crashes, out-of-memory exceptions or excessive CPU usage; affecting the following packages: react-server-dom-webpack, react-server-dom-parcel, react-server-dom-turbopack (versions 19.0.0 through 19.0.5, 19.1.0 through 19.1.6, and 19.2.0 through 19.2.5).
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-2026-23870 has been found in react-server-dom-parcel.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade react-server-dom-parcel to 19.2.6 or later.
If unsure, ask your IT team or search "react-server-dom-parcel CVE-2026-23870" on the vendor's site.
CVE-2026-23870 (react-server-dom-parcel) — CWE-400 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 19.2.6 — apply immediately
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.
A vulnerability (CWE-400) exists in react-server-dom-parcel.
Check the vendor advisory for the affected versions of react-server-dom-parcel.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 19.2.6.
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. Run grep -r 'react-server-dom-parcel' . against your dependency files (package-lock.json, requirements.txt, go.sum) 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
grep -r 'react-server-dom-parcel' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
react-server-dom-parcelを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade react-server-dom-parcel to 19.2.6ステージング環境で 19.2.6 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-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
References
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com