VULNpocalypse

CVE-2025-55184: 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

A pre-authentication denial of service vulnerability exists in 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. The vulnerable code unsafely deserializes payloads from HTTP requests to Server Function endpoints, which can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.

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 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 assesses that a public proof of concept exists. Automatable: yes. Technical impact: partial.

Public exploit evidence (Exploit Observer)

Also known as: CNNVD-202512-2084, EUVD-2025-202877, EUVD-2025-202926, GHSA-2m3v-v2m8-q956, GHSA-5j59-xgg2-r9c4, GHSA-7gmr-mq3h-m5h9, GHSA-mwv6-3258-q52c, SNYK-JS-NEXT-14400640, SNYK-JS-REACTSERVERDOMPARCEL-14400634, SNYK-JS-REACTSERVERDOMPARCEL-14400642, SNYK-JS-REACTSERVERDOMWEBPACK-14400637, SNYK-JS-REACTSERVERDOMWEBPACK-14400641, SNYK-JS-VITEJSPLUGINRSC-14401638, SNYK-JS-VITEJSPLUGINRSC-14401658

VEDAS cluster: VEDAS:AARDVARKADVENTURE

Exploit Observer links 19 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (19)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Research and write-ups (4)

Vulnerability databases and vendor advisories (21)

Catalogue entries, not exploit evidence.

433 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
0.666
very likely to be attacked soon
VEDAS
0.984
strong exploit evidence
On CISA KEV
Not listed
Detection rule
Nuclei · Suricata
EPSS (chance of attack)
10No cve-scores data 2026-02-22 to 2026-08-08no data0.1CVE-2025-55184 EPSS over time2025-122026-11-01
VEDAS (exploit evidence)
10No cve-scores data 2026-02-22 to 2026-08-08no data0.9CVE-2025-55184 VEDAS over time2025-122026-11-01

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

ProductAffectedNot affected
Meta react-server-dom-webpackfrom 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-turbopackfrom 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-parcelfrom 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

Nuclei template (active check)

React Server Components - Insecure Deserialization

A pre-authentication denial of service vulnerability exists in 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. The vulnerable code unsafely deserializes payloads from HTTP requests to Server Function endpoints, which can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.

Name and description quoted from the template, written by VEDAS.

The template sends 3 requests (GET /, GET {{current_chunk}}, POST /); it decides using dsl, regex matchers. Severity in the template: high. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash
nuclei -u https://your-host -t CVE-2025-55184.yaml
Show the template (106 lines)
yaml
id: CVE-2025-55184

info:
  name: "React Server Components - Insecure Deserialization"
  author: vedas-arpsyndicate
  severity: high
  description: |
    A pre-authentication denial of service vulnerability exists in 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. The vulnerable code unsafely deserializes payloads from
    HTTP requests to Server Function endpoints, which can cause an infinite loop that hangs the server process and
    may prevent future HTTP requests from being served.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2025-55184&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=react&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    cvss-score: 7.5
    cve-id: CVE-2025-55184
    cwe-id: CWE-502
  metadata:
    verified: false
  tags: cve,cve2025,react,nextjs,dos,vkev
flow: |
  http(1);
  for (let chunk of iterate("chunk_path")) {
    set("current_chunk", chunk);
    if (http(2)) {
      http(3);
      break;
    }
  }

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}

    host-redirects: true
    max-redirects: 2

    matchers:
      - type: dsl
        internal: true
        dsl:
          - 'contains(body, "/_next/static/")'
          - 'status_code == 200'
        condition: and

    extractors:
      - type: regex
        name: chunk_path
        part: body
        internal: true
        group: 1
        regex:
          - '"(/_next/static/[^"]+\.js)"'

  - raw:
      - |
        GET {{current_chunk}} HTTP/1.1
        Host: {{Hostname}}

    host-redirects: true
    max-redirects: 2

    matchers:
      - type: dsl
        internal: true
        dsl:
          - 'compare_versions(react_version, ">= 19.0.0", "<= 19.2.1")'
          - 'status_code == 200'
        condition: and

    extractors:
      - type: regex
        name: react_version
        part: body
        internal: true
        group: 1
        regex:
          - '\.version;if\("(\d+\.\d+\.\d+)'

  - raw:
      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        Accept: text/x-component
        Content-Type: application/x-www-form-urlencoded
        Next-Action: x

        0=["$F1"]&1={"id":"x","bound":null}

    matchers:
      - type: dsl
        dsl:
          - 'contains(body, "Server action not found")'
          - 'contains(content_type, "text/plain")'
          - 'status_code == 404'
        condition: and

    extractors:
      - type: dsl
        dsl:
          - '"react=" + react_version'

CVE-2025-55184.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2025-55184 React Server Components - Insecure Deserialization. Add them to your Suricata rule set and reload.

Show the rules
suricata
alert http $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"VEDAS CVE-2025-55184 React Server Components - Insecure Deserialization"; flow:established,to_server; http.request_body; content:"0=[$F1]&1={id:x,bound:null}"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2025-55184; reference:url,https://www.exploit.observer/?keyword=CVE-2025-55184&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=react&match=exact; sid:1011527; rev:1;)

CVE-2025-55184.rules on GitHub

Advisories on this CVE

References

Exploits and technical analysis

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. 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.