# CVE-2026-44907: Meta React denial of service in Server Functions

Source: https://junglewise.ai/threats/cve-2026-44907-meta-react-denial-of-service-in-server-functions  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-21. Updated: 2026-07-25  
License: CC BY 4.0 with a link back

CVE-2026-44907 · Severity: high · CVSS 7.5 · Published 2026-07-21

A denial of service vulnerability exists in React's server-side rendering components used to handle Server Functions. An attacker can send specially crafted web requests to crash the application or make it unresponsive by exhausting its memory and processing power. This can lead to service outages and impact the availability of web applications built with React Server Components.

Technologies: [react-server-dom-parcel (npm)](https://junglewise.ai/threats/technologies/react-server-dom-parcel), [react-server-dom-turbopack (npm)](https://junglewise.ai/threats/technologies/react-server-dom-turbopack), [react-server-dom-webpack (npm)](https://junglewise.ai/threats/technologies/react-server-dom-webpack). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-44907 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-44907 being exploited in the wild.

**How severe is CVE-2026-44907?** High severity, with a CVSS score of 7.5, published 21 July 2026.

**Which products and versions are affected?** react-server-dom-parcel (npm) SEMVER:introduced=19.1.0,fixed=19.1.9; react-server-dom-turbopack (npm) SEMVER:introduced=19.0.0,fixed=19.0.8; react-server-dom-webpack (npm) SEMVER:introduced=19.0.0,fixed=19.0.8.

**Is there a fix for CVE-2026-44907?** Yes. react-server-dom-parcel (npm): upgrade to 19.1.9 or later; react-server-dom-turbopack (npm): upgrade to 19.0.8 or later; react-server-dom-webpack (npm): upgrade to 19.0.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-44907 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-44907?** Check whether you run react-server-dom-parcel (npm), react-server-dom-turbopack (npm) or react-server-dom-webpack (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- react-server-dom-parcel (npm): upgrade to 19.1.9 or later

  ```sh
  npm install react-server-dom-parcel@19.1.9
  ```

- react-server-dom-turbopack (npm): upgrade to 19.0.8 or later

  ```sh
  npm install react-server-dom-turbopack@19.0.8
  ```

- react-server-dom-webpack (npm): upgrade to 19.0.8 or later

  ```sh
  npm install react-server-dom-webpack@19.0.8
  ```


## Technical details

The vulnerability is classified as Uncontrolled Resource Consumption (CWE-400) and Allocation of Resources Without Limits or Throttling (CWE-770) within the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages. It occurs when processing specially crafted HTTP requests directed at server function endpoints. An unauthenticated remote attacker can exploit this to trigger out-of-memory (OOM) exceptions or excessive CPU utilization, leading to a denial of service. The issue affects React 19.x branches and has been patched in versions 19.0.8, 19.1.9, and 19.2.8.

## Affected products

- Meta react-server-dom-webpack 19.0.0-19.0.7, 19.1.0-19.1.8, 19.2.0-19.2.7
- Meta react-server-dom-parcel 19.0.0-19.0.7, 19.1.0-19.1.8, 19.2.0-19.2.7
- Meta react-server-dom-turbopack 19.0.0-19.0.7, 19.1.0-19.1.8, 19.2.0-19.2.7

## Identifiers

- CVE-2026-44907
- GHSA-wx67-qw84-cm4g

## Timeline

- 2026-07-21: disclosed
- 2026-07-21: advisory: NVD publication date
- 2026-07-24: advisory: GitHub Advisory reviewed

## References

- [https://github.com/react/react/security/advisories/GHSA-wx67-qw84-cm4g](https://github.com/react/react/security/advisories/GHSA-wx67-qw84-cm4g)
- [https://api.github.com/repos/react/react/security-advisories/GHSA-wx67-qw84-cm4g](https://api.github.com/repos/react/react/security-advisories/GHSA-wx67-qw84-cm4g)

## Related threats

- [React Server Components remote code execution via deserialization](https://junglewise.ai/threats/cve-2026-126187-react-unauthenticated-remote-code-execution-in-react-server)
- [Facebook React Denial of Service in React Server Components](https://junglewise.ai/threats/cve-2026-23870-facebook-react-denial-of-service-in-react-server-components)
- [Meta React Server Components denial of service in Server Functions](https://junglewise.ai/threats/cve-2026-23869-meta-react-server-components-denial-of-service-in-server)
- [Meta React Server Components denial of service in Server Function endpoints](https://junglewise.ai/threats/cve-2026-23864-meta-react-server-components-denial-of-service-in-server-function)
- [It was found that the fix addressing in React Server Components was incomplete and does not prevent a denial of service attac](https://junglewise.ai/threats/cve-2025-67779-react-server-components-denial-of-service-via-incomplete-patch)