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Fencer Vulns
high 7.5

CVE-2026-23870 json

Next.js Vulnerable to Denial of Service with Server Components

published 2026-05-06 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-27867 , GHSA-8h8q-6873-q5fj , GHSA-rv78-f8rc-xrxh

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

A denial of service vulnerability could be triggered by sending specially crafted HTTP requests to server function endpoints, this could lead to server crashes, out-of-memory exceptions or excessive CPU usage; affecting the following packages: react-server-dom-webpack, react-server-dom-parcel, react-server-dom-turbopack (versions 19.0.0 through 19.0.5, 19.1.0 through 19.1.6, and 19.2.0 through 19.2.5).

Patch / fix

  • npm next 15.5.16, 16.2.5
  • npm react-server-dom-parcel 19.0.6, 19.1.7, 19.2.6
  • npm react-server-dom-turbopack 19.0.6, 19.1.7, 19.2.6
  • npm react-server-dom-webpack 19.0.6, 19.1.7, 19.2.6

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-2026-23870 updated cvss 7.5

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

  • Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9
    not affected: vulnerable code 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
6 mo ago

Exploit prediction

1.53% chance of exploitation in the next 30 days, higher than 74% 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
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 next
>=13.0.0, <15.5.16
>=16.0.0, <16.2.5
15.5.16
16.2.5
npm react-server-dom-parcel
>=19.0.0, <19.0.6
>=19.1.0, <19.1.7
>=19.2.0, <19.2.6
19.0.6
19.1.7
19.2.6
npm react-server-dom-turbopack
>=19.0.0, <19.0.6
>=19.1.0, <19.1.7
>=19.2.0, <19.2.6
19.0.6
19.1.7
19.2.6
npm react-server-dom-webpack
>=19.0.0, <19.0.6
>=19.1.0, <19.1.7
>=19.2.0, <19.2.6
19.0.6
19.1.7
19.2.6

Affected products

  • Meta react-server-dom-turbopack
  • Meta react-server-dom-parcel
  • Meta react-server-dom-webpack

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
  • CWE-400 Uncontrolled Resource Consumption
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 vercel/next.js published their own advisory on GitHub. Reviewed sources take precedence over it.