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Public proof of conceptFix availableAwaiting NVD analysis

CVE-2026-23869

A public proof of concept exists; no exploitation attested.

  • Published2026-04-08
  • Fixed in19.2.5 · 19.1.6 · 19.0.5
  • WeaknessCWE-400 · CWE-502 · CWE-770

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-04-0820:16CVE publishedNVD

Versions per branch

OSV
react-server-dom-parcel
BranchAffectedFixed in
19.2≥ 19.2.0, < 19.2.519.2.5
19.1≥ 19.1.0, < 19.1.619.1.6
19.0≥ 19.0.0, < 19.0.519.0.5
react-server-dom-turbopack
BranchAffectedFixed in
19.2≥ 19.2.0, < 19.2.519.2.5
19.1≥ 19.1.0, < 19.1.619.1.6
19.0≥ 19.0.0, < 19.0.519.0.5
react-server-dom-webpack
BranchAffectedFixed in
19.2≥ 19.2.0, < 19.2.519.2.5
19.1≥ 19.1.0, < 19.1.619.1.6
19.0≥ 19.0.0, < 19.0.519.0.5

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA3 products

As Meta, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Meta react-server-dom-turbopackother versions: not affected
    Affected
    • ≥ 19.0.0, ≤ 19.0.4no fix statedsemver
    • ≥ 19.1.0, ≤ 19.1.5no fix statedsemver
    • ≥ 19.2.0, ≤ 19.2.4no fix statedsemver
  • Meta react-server-dom-parcelother versions: not affected
    Affected
    • ≥ 19.0.0, ≤ 19.0.4no fix statedsemver
    • ≥ 19.1.0, ≤ 19.1.5no fix statedsemver
    • ≥ 19.2.0, ≤ 19.2.4no fix statedsemver
  • Meta react-server-dom-webpackother versions: not affected
    Affected
    • ≥ 19.0.0, ≤ 19.0.4no fix statedsemver
    • ≥ 19.1.0, ≤ 19.1.5no fix statedsemver
    • ≥ 19.2.0, ≤ 19.2.4no fix statedsemver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-04-08

Distribution builds and vendor advisories

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-isTuxCare:npmfrom 19.2.0-tuxcare.0 · fixed in 19.2.0-tuxcare.7and 7 other packages

Vendor advisories

  • CVE-2026-23869 Red Hat Product Security

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

Full record on NVD

Fix

  1. Update react-server-dom-parcel to 19.2.5 · 19.1.6 · 19.0.5

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-04-08
  • CNACVSS 3.17.5known since 2026-10-23
  • CISA-ADPweakness (CWE)CWE-400, CWE-5022026-04-08
  • CNAweakness (CWE)CWE-770known since 2026-10-23
  • FIRST EPSSEPSS score1.6 %2026-11-08
  • PoC-in-GitHubproof of concept3known since 2026-11-01
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-04-10

Identifiers

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
2026-04-08
Last Modified
2026-07-25
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-479c-33wc-g2pg

Frequently asked questions

What is CVE-2026-23869?

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.

Is CVE-2026-23869 actively exploited?

Active exploitation of CVE-2026-23869 has not been confirmed. Its EPSS score was 1.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-23869?

CVE-2026-23869 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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