Skip to content
Fencer Vulns
high 7.5

CVE-2026-23869 json

React Server Components have a Denial of Service Vulnerability

published 2026-04-08 7 mo ago modified 2026-09-10 59 d ago also EUVD-2026-20584 , GHSA-479c-33wc-g2pg , GHSA-q4gf-8mx6-v5v3

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm react-server-dom-parcel 19.0.5, 19.1.6, 19.2.5
  • npm react-server-dom-turbopack 19.0.5, 19.1.6, 19.2.5
  • npm react-server-dom-webpack 19.0.5, 19.1.6, 19.2.5
  • npm next 15.5.15, 16.2.3

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-23869 updated cvss 7.5

react-server-dom-parcel: react-server-dom-turbopack: react-server-dom-webpack: denial of service via specially crafted HTTP requests to Server Function endpoints

  • Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

1.57% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm react-server-dom-parcel
>=19.0.0, <19.0.5
>=19.1.0, <19.1.6
>=19.2.0, <19.2.5
19.0.5
19.1.6
19.2.5
npm react-server-dom-turbopack
>=19.0.0, <19.0.5
>=19.1.0, <19.1.6
>=19.2.0, <19.2.5
19.0.5
19.1.6
19.2.5
npm react-server-dom-webpack
>=19.0.0, <19.0.5
>=19.1.0, <19.1.6
>=19.2.0, <19.2.5
19.0.5
19.1.6
19.2.5
npm next
>=13.0.0, <15.5.15
>=16.0.0-beta.0, <16.2.3
15.5.15
16.2.3

Affected products

  • Meta react-server-dom-turbopack
  • Meta react-server-dom-parcel
  • Meta react-server-dom-webpack
  • Red Hat Red Hat OpenShift AI (RHOAI)

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-770 Allocation of Resources Without Limits or Throttling
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of react/react published their own advisory on GitHub. Reviewed sources take precedence over it.