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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 triggered when a vulnerable server-side React deployment deserializes specially crafted HTTP requests sent to Server Function endpoints. Available reporting indicates the issue is associated with pathological processing in request deserialization and handling logic in the React Flight protocol, where inadequate structural or type constraints on inbound payloads can drive excessive resource consumption. 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. The issue is reachable in applications that execute React on the server through frameworks, bundlers, or plugins that support React Server Components, including App Router deployments in Next.js.
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No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
18 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.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.