react-server-dom-webpack: Uncontrolled Resource Consumption
CVE-2026-23864 is a high-severity uncontrolled resource consumption vulnerability in react-server-dom-webpack from Meta, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 19.0.4, 19.1.5, 19.2.4 as the first without the flaw, so updating react-server-dom-webpack to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 2.58% chance of exploitation within 30 days, higher than 85% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update react-server-dom-webpack to 19.0.4 or 19.1.5 or 19.2.4, whichever matches your release line, or a later version.
- Update react-server-dom-turbopack to 19.0.4 or 19.1.5 or 19.2.4, whichever matches your release line, or a later version.
- Update react-server-dom-parcel to 19.0.4 or 19.1.5 or 19.2.4, whichever matches your release line, or a later version.
- Read the advisory on facebook.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Meta | react-server-dom-webpack | 19.0.0 up to, but not including, 19.0.4; 19.1.0 up to, but not including, 19.1.5; 19.2.0 up to, but not including, 19.2.4 | 19.0.4, 19.1.5, 19.2.4 |
| Meta | react-server-dom-turbopack | 19.0.0 up to, but not including, 19.0.4; 19.1.0 up to, but not including, 19.1.5; 19.2.0 up to, but not including, 19.2.4 | 19.0.4, 19.1.5, 19.2.4 |
| Meta | react-server-dom-parcel | 19.0.0 up to, but not including, 19.0.4; 19.1.0 up to, but not including, 19.1.5; 19.2.0 up to, but not including, 19.2.4 | 19.0.4, 19.1.5, 19.2.4 |
| Red Hat | Streams for Apache Kafka 2.9.4 | Not specified in the record | Not stated |
| Red Hat | Streams for Apache Kafka 3.2.0 | Not specified in the record | Not stated |
| React | 19.0.0 up to, but not including, 19.0.4; 19.1.0 up to, but not including, 19.1.5; 19.2.0 up to, but not including, 19.2.4 | 19.0.4, 19.1.5, 19.2.4 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | CISA (ADP) |
| CVSS 3.1 | 7.5 | High | CNA |
Official 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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Uncontrolled Resource Consumption
The product does not properly control the allocation and maintenance of a limited resource.
How developers prevent this class of flaw
- Ensure that protocols have specific limits of scale placed on them.
- Ensure that all failures in resource allocation place the system into a safe posture.
More Uncontrolled Resource Consumption vulnerabilities (CWE-400)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other references
Other vulnerabilities in react-server-dom-webpack
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 10.0 Critical severity
Recent Uncontrolled Resource Consumption vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 8.2 High severity
- 8.2 High severity
- 7.5 High severity
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