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CVE-2026-23869

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-08 · updated 2026-07-25
• Weakness: CWE-400

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.

Affected products

• Meta react-server-dom-parcel: from 19.0.0 through 19.0.4; from 19.1.0 through 19.1.5; from 19.2.0 through 19.2.4
• Meta react-server-dom-turbopack: from 19.0.0 through 19.0.4; from 19.1.0 through 19.1.5; from 19.2.0 through 19.2.4
• Meta react-server-dom-webpack: from 19.0.0 through 19.0.4; from 19.1.0 through 19.1.5; from 19.2.0 through 19.2.4

References

• https://github.com/facebook/react/security/advisories/GHSA-479c-33wc-g2pg
• https://access.redhat.com/security/cve/CVE-2026-23869
• https://bugzilla.redhat.com/show_bug.cgi?id=2456663
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23869.json

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