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CVE-2026-23864 is a high-severity denial-of-service vulnerability affecting React Server Components in the packages react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. The flaw is triggered when a server-side deployment exposes Server Function endpoints and processes specially crafted HTTP requests through vulnerable request deserialization and handling paths. Depending on the exercised code path, application configuration, and surrounding application logic, exploitation can drive excessive CPU consumption, trigger out-of-memory conditions, or crash the server process. The issue affects server-side React Server Components deployments, including downstream frameworks such as Next.js App Router that rely on the vulnerable react-server-dom packages. Client-only React applications that do not execute React Server Components on the server are not affected.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
42 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously addressed ORDS Core vulnerability mentioned as part of Oracle's security history.
An earlier denial of service vulnerability in the React Server Components advisory chain, noted as additional DoS cases discovered after incomplete original fixes.
A prior React Server Components denial-of-service vulnerability referenced because existing Cloudflare WAF rules for it also cover newly disclosed DoS issues.
An earlier denial-of-service vulnerability in React Server Components whose initial fix was incomplete, leaving systems exposed to the follow-up issue CVE-2026-23869.
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.