KEV Intelligence

Vulnerability report

Active exploitation observed Confirmed confidence In CISA KEV

CVE-2025-55182

react-server-dom-webpack Remote Code Execution

Meta / react-server-dom-webpack · 19.0.0 to <= 19.0.0

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Severity
CVSS 10.0 · Critical
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
99.6%
First observed
09 Jun 2026
Last observed
18 Aug 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-55182 is an unauthenticated vulnerability affecting Meta react-server-dom-webpack and 2 other products. A pre-authentication remote code execution vulnerability exists in React Server Components versions...

Is it exploited?

Yes. KEV Intelligence sensors observed exploitation attempts with confirmed confidence.

Who is affected?

Meta / react-server-dom-webpack 19.0.0 to <= 19.0.0.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

react-server-dom-webpack Remote Code Execution

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.

Vendor Product Affected Status
Meta react-server-dom-webpack Through 19.0.0 Affected
Meta react-server-dom-webpack Through 19.1.1 Affected
Meta react-server-dom-webpack Through 19.2.0 Affected
Meta react-server-dom-turbopack Through 19.0.0 Affected
Meta react-server-dom-turbopack Through 19.1.1 Affected
Meta react-server-dom-turbopack Through 19.2.0 Affected
Meta react-server-dom-parcel Through 19.0.0 Affected
Meta react-server-dom-parcel Through 19.1.1 Affected
Meta react-server-dom-parcel Through 19.2.0 Affected
Published
03 Dec 2025
Exploitation Reported
01 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa nuclei_scanner malware

CVE References

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

Independent exploitation attestation added to the KEV Intelligence record.

Active exploitation observed

KEV Intelligence sensor

First observed 15 Jun 2026

First-party sensor telemetry confirms matching exploitation attempts.

Used in malware

CVE

Recorded 02 Jun 2026

Malware families have been linked to exploitation of this CVE.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

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Source Added
The Shadowserver First 2026-06-01 00:00 UTC
CVE 2026-06-01 10:45 UTC
CISA 2026-06-02 14:04 UTC
KEV Intelligence 2026-07-03 10:18 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Aggregate observations show the scale, recency, and distribution of activity without overstating sparse data.

1,183

Attempts observed

79

Unique attacker IPs

11

Attacker countries

AU · BE · CA · DE · FR · GB · IE · IN · NL · SG · US

28

Sensors observed

Exploitation attempts over the last 73 days

Daily events observed by KEV Intelligence sensors

Updated 19 Aug 2026

0
8
9
1
2
5
0
18
0
12
0
0
0
0
1
2
2
4
1
28
26
40
35
4
19
197
28
9
11
8
53
72
13
117
23
18
35
115
158
12
11
13
9
56
5
32
27
19
40
67
14
4
204
114
36
4
2
12
12
48
80
18
49
0
168
36
0
23
0
0
96
12
0
8 Jun 23 Jun 8 Jul 23 Jul 19 Aug

First observed 09 Jun 2026 · Last observed 18 Aug 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
57
User-Agents
19

Raw values available in Pro and Enterprise.

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

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Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-55182.yaml 01 Jun 2026

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

10.0 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

99.6%

Weaknesses

Deserialization of Untrusted Data CWE-502

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

React Server Components - Remote Code Execution

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. Observed by KEV Intelligence sensors

    Evidence-backed exploitation signal

  2. Indicators of compromise added (174)

    Indicators of compromise recorded

  3. Public PoC available

    Public proof-of-concept code published

  4. First public exploitation report

    Exploit observed in malware

  5. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  6. Nuclei template available

    Scanner coverage available

  7. KEV confirmed by CVE

    Exploitation attested by an external source

  8. Added to KEV Intelligence KEV Feed

    High-confidence, third-party attested exploitation

  9. CVE published

    Vulnerability disclosed publicly

  10. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-55182

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2025-55182",
  "confidence": "Confirmed",
  "cvss_score": 10.0,
  "cvss_estimated": false,
  "epss_score": 0.99616,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 1183, "sensors": 28 }
}

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