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CVE-2026-23870 is a high-severity denial-of-service vulnerability in React Server Components affecting the packages react-server-dom-webpack, react-server-dom-parcel, and react-server-dom-turbopack. The flaw is reachable through server function endpoints exposed by server-side React deployments, including frameworks that use React Server Components such as Next.js App Router and similar integrations. A remote attacker can send specially crafted HTTP requests that are processed by the server-side request deserialization and handling logic for React Server Components, leading to pathological resource consumption. Reported outcomes include excessive CPU usage, out-of-memory exceptions, and server crashes. Affected versions are 19.0.0 through 19.0.5, 19.1.0 through 19.1.6, and 19.2.0 through 19.2.5 of the affected react-server-dom packages.
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No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity denial-of-service vulnerability in React Server Components / Next.js App Router caused by unsafe deserialization in the React Flight protocol, allowing crafted requests to trigger excessive CPU usage.
A denial-of-service vulnerability in React Server Components affecting react-server-dom-* packages and impacting Next.js applications that use Server Functions, Partial Prerendering with Cache Components, or the Image Optimization API.
A denial of service vulnerability in React Server Components server function endpoint handling that allows unauthenticated remote attackers to crash servers or exhaust CPU/memory via crafted HTTP requests.
A high-severity denial-of-service vulnerability affecting React Server Components and corresponding Next.js functionality.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.