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Fencer Vulns
high 7.5

CVE-2026-23864 json

React Server Components have multiple Denial of Service Vulnerabilities

published 2026-01-26 9 mo ago modified 2026-09-10 59 d ago also EUVD-2026-4673 , GHSA-83fc-fqcc-2hmg , GHSA-h25m-26qc-wcjf

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.6%
EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm react-server-dom-parcel 19.0.4, 19.1.5, 19.2.4
  • npm react-server-dom-turbopack 19.0.4, 19.1.5, 19.2.4
  • npm react-server-dom-webpack 19.0.4, 19.1.5, 19.2.4
  • npm next 15.0.8, 15.1.12, 15.2.9, 15.3.9, 15.4.11, 15.5.10, 15.6.0-canary.61, 16.0.11, 16.1.5
  • Meta react-server-dom-webpack 19.0.4, 19.1.5, 19.2.4
  • Meta react-server-dom-turbopack 19.0.4, 19.1.5, 19.2.4
  • Meta react-server-dom-parcel 19.0.4, 19.1.5, 19.2.4

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-2026-23864 updated cvss 7.5

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

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
9 mo ago

Exploit prediction

2.58% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
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
CNA 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, <19.0.4
>=19.1.0-canary-7130d0c6-20241212, <19.1.5
>=19.2.0-canary-63779030-20250328, <19.2.4
19.0.4
19.1.5
19.2.4
npm react-server-dom-turbopack
>=19.1.0-canary-7130d0c6-20241212, <19.1.5
>=19.0.0, <19.0.4
>=19.2.0-canary-63779030-20250328, <19.2.4
19.1.5
19.0.4
19.2.4
npm react-server-dom-webpack
>=19.2.0-canary-63779030-20250328, <19.2.4
>=19.1.0-canary-7130d0c6-20241212, <19.1.5
>=19.0.0, <19.0.4
19.2.4
19.1.5
19.0.4
npm next
>=13.0.0, <15.0.8
>=15.1.1-canary.0, <15.1.12
>=15.2.0-canary.0, <15.2.9
>=15.3.0-canary.0, <15.3.9
>=15.4.0-canary.0, <15.4.11
>=15.5.1-canary.0, <15.5.10
>=15.6.0-canary.0, <15.6.0-canary.61
>=16.0.0-beta.0, <16.0.11
>=16.1.0-canary.0, <16.1.5
15.0.8
15.1.12
15.2.9
15.3.9
15.4.11
15.5.10
15.6.0-canary.61
16.0.11
16.1.5

Affected products

  • Meta react-server-dom-webpack
  • Meta react-server-dom-turbopack
  • Meta react-server-dom-parcel
  • Red Hat Streams for Apache Kafka 2.9.4
  • Red Hat Streams for Apache Kafka 3.2.0

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-1284 Improper Validation of Specified Quantity in Input
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.