Bug 2571391 (CVE-2026-126187)

Summary: CVE-2026-126187 react-server-dom-parcel: react-server-dom-turbopack: react-server-dom-webpack: React: Unauthenticated Remote Code Execution in React Server Components
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: anjoseph, blitton, chfoley, dbosanac, gotiwari, jhorak, jlanda, jprabhak, jreimann, jturenov, kshier, lchilton, mbarnett, mdessi, mrizzi, mvyas, pcattana, rbobbitt, rhel-process-autobot, sdawley, sfeifer, simaishi, stcannon, swoodman, watson-tool-maintainers, wtam, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in React Server Components. A remote, unauthenticated attacker can exploit this issue by submitting specially crafted payloads to server-side frameworks processing multiple typed data arrays and user-controlled values. Successful exploitation allows an attacker to achieve arbitrary code execution on the affected server.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-11-10 22:41:19 UTC 
React is a JavaScript library for building user interfaces. From 19.0.0 until 19.0.9, 19.1.10, 19.2.9, and 19.3.1, the react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack packages are vulnerable to unauthenticated remote code execution through crafted payloads targeting frameworks that support React Server Components. The vulnerability only affects extremely rare cases where responses transport multiple typed arrays and an attacker-controlled value. Applications whose React code does not use a server are not affected. Applications that do not use a framework, bundler, or bundler plugin that supports React Server Components are not affected. This issue is fixed in versions 19.0.9, 19.1.10, 19.2.9, and 19.3.1.