Denial of Service in React Server Components Server Function endpoints
CVE-2026-23864 is a high-severity denial-of-service vulnerability affecting React Server Components, specifically the packages react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack in vulnerable 19.0.x, 19.1.x, and 19.2.x release lines. The issue is triggered when a specially crafted HTTP request is sent to a Server Function endpoint and processed through vulnerable request deserialization paths. Depending on the exercised code path, application configuration, and application code, the malformed input can cause excessive CPU consumption, out-of-memory exceptions, or outright server crashes. The issue also affects downstream frameworks that embed these packages, including Next.js App Router deployments.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
40 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An earlier denial of service vulnerability in the React Server Components advisory chain, noted as additional DoS cases discovered after incomplete original fixes.
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.
Unknown (listed as a trending CVE affecting React Server Components; no technical details provided in the content).
A high-severity denial-of-service vulnerability in React Server Components/Server Functions (server-dom packages) where crafted HTTP requests can cause resource exhaustion (CPU/memory) and crash the server.
The version that knows your environment.
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.