High severity · published Jan 26, 2026
CVE-2026-23864
Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack,…
7.5
CVSS
2.6%
EPSS
No
On KEV
Description
Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack.
The vulnerabilities are triggered by sending specially crafted HTTP requests to Server Function endpoints, and could lead to server crashes, out-of-memory exceptions or excessive CPU usage; depending on the vulnerable code path being exercised, the application configuration and application code.
Strongly consider upgrading to the latest package versions to reduce risk and prevent availability issues in applications using React Server Components.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.6% · higher than 85% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RE
react-server-dom-parcel · Meta
19.0.0 before 19.0.4; 19.1.0 before 19.1.5; 19.2.0 before 19.2.4 · source: vendor
RE
react-server-dom-turbopack · Meta
19.0.0 before 19.0.4; 19.1.0 before 19.1.5; 19.2.0 before 19.2.4 · source: vendor
RE
react-server-dom-webpack · Meta
19.0.0 before 19.0.4; 19.1.0 before 19.1.5; 19.2.0 before 19.2.4 · source: vendor
RE
React · Facebook
19.0.0 before 19.0.4; 19.1.0 before 19.1.5; 19.2.0 before 19.2.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23864
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-23864
Vendor Advisory
https://www.facebook.com/security/advisories/cve-2026-23864
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:13571
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:34608
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-23864
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2433059
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23864.json
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