CVE-2026-23869
A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel,…
- Published
- Updated
- Reserved
- Assigned by
- Meta
Description
A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| MetaCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| redhat-SADPADP (enrichment) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 1.6% · top 24% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
- (CWE-502) Deserialization of Untrusted Data, (CWE-400) Uncontrolled Resource Consumption
- CWE-502 Deserialization of Untrusted Data (opens in a new tab)All about CWE-502 and its CVEs
- CWE-400 Uncontrolled Resource Consumption (opens in a new tab)All about CWE-400 and its CVEs
- CWE-770: Allocation of Resources Without Limits or Throttling (opens in a new tab)All about CWE-770 and its CVEs
Affected products
Meta · react-server-dom-turbopack
- affected 19.0.0 – ≤ 19.0.4
- affected 19.1.0 – ≤ 19.1.5
- affected 19.2.0 – ≤ 19.2.4
Meta · react-server-dom-parcel
- affected 19.0.0 – ≤ 19.0.4
- affected 19.1.0 – ≤ 19.1.5
- affected 19.2.0 – ≤ 19.2.4
Meta · react-server-dom-webpack
- affected 19.0.0 – ≤ 19.0.4
- affected 19.1.0 – ≤ 19.1.5
- affected 19.2.0 – ≤ 19.2.4
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npmreact-server-dom-parcelGHSA-479c-33wc-g2pg (opens in a new tab)
- npmreact-server-dom-turbopackGHSA-479c-33wc-g2pg (opens in a new tab)
- npmreact-server-dom-webpackGHSA-479c-33wc-g2pg (opens in a new tab)
References (4)
- https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg (opens in a new tab)x_refsource_CONFIRM
- https://access.redhat.com/security/cve/CVE-2026-23869 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2456663 (opens in a new tab)issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23869.json (opens in a new tab)x_sadp-csaf-vex
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-479c-33wc-g2pg (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-23869)Record last updated .