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HIGH

CVE-2026-23864

react-server-dom-webpack: react-server-dom-parcel: reactreact-server-dom-turbopack: React Server Components: Denial of Service via specially crafted HTTP requests

CVSS v3

7.5

HIGH

EPSS Score

2.6 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

none

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • react-server-dom-parcelnpmfrom 19.2.0-canary-63779030-20250328 · fixed in 19.2.4and 1 other package
  • react-server-dom-webpacknpmfrom 19.0.0 · fixed in 19.0.4

Vendor advisories

  • CVE-2026-23864 Red Hat Product Security2 products fixed

    react-server-dom-webpack: react-server-dom-parcel: reactreact-server-dom-turbopack: React Server Components: Denial of Service via specially crafted HTTP requests

  • RHSA-2026:34608 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Streams for Apache Kafka 2.9.4 release and security update

  • RHSA-2026:13571 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Streams for Apache Kafka 3.2.0 release and security update

Full record on NVD

Description

Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack. The vulnerabilities are triggered by sending specially crafted HTTP requests to Server Function endpoints, and could lead to server crashes, out-of-memory exceptions or excessive CPU usage; depending on the vulnerable code path being exercised, the application configuration and application code. Strongly consider upgrading to the latest package versions to reduce risk and prevent availability issues in applications using React Server Components.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-01-26
Last Modified
2026-02-13

Frequently asked questions

What is CVE-2026-23864?

Multiple denial of service vulnerabilities exist in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack, react-server-dom-webpack. The vulnerabilities are triggered by sending specially crafted HTTP requests to Server Function endpoints, and could lead to server crashes, out-of-memory exceptions or excessive CPU usage; depending on the vulnerable code path being exercised, the application configuration and application code. Strongly consider upgrading to the latest package versions to reduce risk and prevent availability issues in applications using React Server Components.

Is CVE-2026-23864 actively exploited?

Active exploitation of CVE-2026-23864 has not been confirmed. Its EPSS score was 2.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-23864?

CVE-2026-23864 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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