CVE-2025-55183: 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
An information leak vulnerability exists in specific configurations of React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. A specifically crafted HTTP request sent to a vulnerable Server Function may unsafely return the source code of any Server Function. Exploitation requires the existence of a Server Function which explicitly or implicitly exposes a stringified argument.
Description quoted from the CVE record (assigned by Meta, published 2025-12-11).
How it can be exploited
Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality low, integrity none, availability none. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA assessment (SSVC): CISA assesses that a public proof of concept exists. Automatable: yes. Technical impact: partial.
Public exploit evidence (Exploit Observer)
Also known as: CNNVD-202512-2086, EUVD-2025-202879, GHSA-925w-6v3x-g4j4, GHSA-w37m-7fhw-fmv9, SNYK-JS-REACTSERVERDOMPARCEL-14400642, SNYK-JS-REACTSERVERDOMWEBPACK-14400641, SNYK-JS-VITEJSPLUGINRSC-14401638
VEDAS cluster: VEDAS:COSMOSFLARE
Exploit Observer links 3 pieces of public exploit code or detection modules that name this CVE or one of its aliases.
Exploit code and modules (3)
Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.
- Code repository: https://github.com/kimtruth/cve-2025-55183-poc
- Code repository: https://github.com/saturate/cve-2025-55183
- Code repository: https://github.com/x-cotang/cve-2025-55183_poc
Research and write-ups (5)
- Research or write-up: https://socprime.com/blog/cve-2025-55183-and-cve-2025-55184-rsc-vulnerabilities
- Research or write-up: https://vercel.com/kb/bulletin/security-bulletin-cve-2025-55184-and-cve-2025-55183
- Research or write-up: https://wardenshield.com/in-depth-analysis-of-react-server-components-vulnerabilities-cve-2025-55184-and-cve-2025-55183
- Research or write-up: https://www.akamai.com/blog/security-research/2025/dec/cve-2025-55183-55184-mitigating-reactnextjs-vulnerabilities
- Research or write-up: https://www.akamai.com/blog/security-research/cve-2025-55183-55184-mitigating-reactnextjs-vulnerabilities
Vulnerability databases and vendor advisories (12)
Catalogue entries, not exploit evidence.
- Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2025-202879
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-925w-6v3x-g4j4
- Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-w37m-7fhw-fmv9
- Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-55183
- Vulnerability database or vendor advisory: https://osv.dev/vulnerability/GHSA-925w-6v3x-g4j4
- Vulnerability database or vendor advisory: https://osv.dev/vulnerability/GHSA-w37m-7fhw-fmv9
- Vulnerability database or vendor advisory: https://security.snyk.io/vuln/SNYK-JS-REACTSERVERDOMPARCEL-14400642
- Vulnerability database or vendor advisory: https://security.snyk.io/vuln/SNYK-JS-REACTSERVERDOMWEBPACK-14400641
- Vulnerability database or vendor advisory: https://security.snyk.io/vuln/SNYK-JS-VITEJSPLUGINRSC-14401638
- Vulnerability database or vendor advisory: https://www.cnnvd.org.cn/home/globalSearch?keyword=CNNVD-202512-2086
- Vulnerability database or vendor advisory: https://www.facebook.com/security/advisories/cve-2025-55183
- Vulnerability database or vendor advisory: https://www.tenable.com/cve/CVE-2025-55183
391 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
- 0.642
very likely to be attacked soon - VEDAS
- 0.971
strong 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 up to and including 19.0.1 from 19.1.0 up to and including 19.1.2 from 19.2.0 up to and including 19.2.1 | Not stated |
| Meta react-server-dom-turbopack | from 19.0.0 up to and including 19.0.1 from 19.1.0 up to and including 19.1.2 from 19.2.0 up to and including 19.2.1 | Not stated |
| Meta react-server-dom-parcel | from 19.0.0 up to and including 19.0.1 from 19.1.0 up to and including 19.1.2 from 19.2.0 up to and including 19.2.1 | 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.
How to fix it
No fixed version or vendor advisory is listed in the CVE record yet. Watch the vendor’s security page.
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
Other references
- https://www.facebook.com/security/advisories/cve-2025-55183 (x_refsource_CONFIRM)
- https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components (x_refsource_CONFIRM)
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.