CVE-2026-23864: Meta react-server-dom-webpack vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
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.
Description quoted from the CVE record (assigned by Meta, published 2026-01-26).
Weakness: CWE-502 Deserialization of Untrusted Data; CWE-400 Uncontrolled Resource Consumption; Improper Validation of Specified Quantity in Input
How it can be exploited
Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality none, integrity none, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: yes. Technical impact: partial.
Public exploit evidence (Exploit Observer)
Also known as: BDU:2026-01949, CNNVD-202601-4352, EUVD-2026-4673, GHSA-83fc-fqcc-2hmg, GHSA-h25m-26qc-wcjf
Exploit Observer has no public exploit code that names this CVE or one of its aliases.
Research and write-ups (2)
- Research or write-up: https://www.akamai.com/blog/security-research/2026/jan/cve-2026-23864-react-nextjs-denial-of-service
- Research or write-up: https://www.akamai.com/blog/security-research/cve-2026-23864-react-nextjs-denial-of-service
Vulnerability databases and vendor advisories (11)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://access.redhat.com/security/cve/cve-2026-23864
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2026-4673
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-83fc-fqcc-2hmg
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-h25m-26qc-wcjf
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-23864
- Vulnerability database or vendor advisory: https://osv.dev/vulnerability/CVE-2026-23864
- Vulnerability database or vendor advisory: https://osv.dev/vulnerability/GHSA-83fc-fqcc-2hmg
- Vulnerability database or vendor advisory: https://osv.dev/vulnerability/GHSA-h25m-26qc-wcjf
- Vulnerability database or vendor advisory: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23864.json
- Vulnerability database or vendor advisory: https://www.cnnvd.org.cn/home/globalSearch?keyword=CNNVD-202601-4352
- Vulnerability database or vendor advisory: https://www.facebook.com/security/advisories/cve-2026-23864
112 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.
VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.
Live scores
- EPSS
- 0.026
some chance of attack soon - VEDAS
- 0.066
little exploit evidence - On CISA KEV
- Not listed
- Detection rule
- None yet
Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish.
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| Meta react-server-dom-webpack | from 19.0.0 before 19.0.4 from 19.1.0 before 19.1.5 from 19.2.0 before 19.2.4 | Not stated |
| Meta react-server-dom-turbopack | from 19.0.0 before 19.0.4 from 19.1.0 before 19.1.5 from 19.2.0 before 19.2.4 | Not stated |
| Meta react-server-dom-parcel | from 19.0.0 before 19.0.4 from 19.1.0 before 19.1.5 from 19.2.0 before 19.2.4 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
Exploit Observer also maps it to: facebook react, meta_platforms_inc react-server-dom-parcel, meta_platforms_inc react-server-dom-turbopack, meta_platforms_inc react-server-dom-webpack.
How to fix it
Fixed versions stated in the CVE record: 19.0.4, 19.1.5, 19.2.4.
Vendor guidance:
- https://access.redhat.com/errata/RHSA-2026:34608 (vendor-advisory, x_refsource_REDHAT)
- https://access.redhat.com/errata/RHSA-2026:13571 (vendor-advisory, x_refsource_REDHAT)
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
Advisories on this CVE
- React2Shell (CVE-2025-55182): the React Server Components RCE, and why the December patch is not enough now (full advisory)
- React2Shell: React Server Components RCE (CVE-2025-55182; Next.js duplicate CVE-2025-66478) (3 Dec 2025)
References
Vendor advisories and patches
- https://access.redhat.com/errata/RHSA-2026:34608 (vendor-advisory, x_refsource_REDHAT)
- https://access.redhat.com/errata/RHSA-2026:13571 (vendor-advisory, x_refsource_REDHAT)
Exploits and technical analysis
- RHBZ#2433059 (issue-tracking, x_refsource_REDHAT)
Other references
- https://www.facebook.com/security/advisories/cve-2026-23864 (x_refsource_CONFIRM)
- https://access.redhat.com/security/cve/CVE-2026-23864 (vdb-entry, x_refsource_REDHAT)
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23864.json (x_sadp-csaf-vex)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.