CVE-2026-23869

HighRCE

Published: 08 April 2026

Published

08 April 2026

Modified

08 April 2026

KEV Added

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Patch

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CVSS Score 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Score 0.0084 74.8th percentile

Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-23869 is a high-severity Uncontrolled Resource Consumption (CWE-400) vulnerability. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 25.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SC-5 (Denial-of-service Protection) and SI-10 (Information Input Validation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Requires timely identification, reporting, and correction of the specific flaw in vulnerable React Server Components packages, directly eliminating the DoS vulnerability.

SC-5 Denial-of-service Protection good match

prevent

Implements denial-of-service protections to limit effects of resource exhaustion attacks triggered by crafted HTTP requests to Server Function endpoints.

SI-10 Information Input Validation good match

prevent

Validates HTTP request payloads to block specially crafted inputs that cause excessive CPU usage via uncontrolled resource consumption or deserialization.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1499.004 Application or System Exploitation Impact

Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.

attack.mitre.org →

Why these techniques?

CVE enables remote exploitation of exposed Server Function endpoints (T1190) via crafted requests that trigger resource exhaustion (T1499.004 Application or System Exploitation).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to…

Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.

Deeper analysisAI

CVE-2026-23869 is a denial-of-service vulnerability in React Server Components, specifically affecting the packages react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack in versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4. The issue arises when specially crafted HTTP requests are sent to Server Function endpoints, where the request payload triggers excessive CPU usage lasting up to a minute before resulting in a catchable thrown error. It has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and is associated with CWE-400 (Uncontrolled Resource Consumption) and CWE-502 (Deserialization of Untrusted Data).

The vulnerability can be exploited remotely by unauthenticated attackers over the network with low complexity and no user interaction required. By sending the crafted HTTP requests to exposed Server Function endpoints, attackers can cause significant CPU exhaustion on the target server, leading to denial of service through resource depletion.

Mitigation details and patches are available in the security advisory published by the React team at https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg. The CVE was published on 2026-04-08.