CVE-2025-55182 (GCVE-0-2025-55182)

Vulnerability from cvelistv5 – Published: 2025-12-03 15:40 – Updated: 2026-10-07 17:58
Summary
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.
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 03:56 UTC
CWE
  • Deserialization of Untrusted Data (CWE-502)
  • CWE-502 - Deserialization of Untrusted Data
Assigner
Meta CNA under the mitre root
CNA scorecard E 44/100 over 16 records in the last 180 days details
Impacted products
Vendor Product Version CPE status
Meta react-server-dom-webpack Affected: 19.0.0 , ≤ 19.0.0 (semver)
Affected: 19.1.0 , ≤ 19.1.1 (semver)
Affected: 19.2.0 , ≤ 19.2.0 (semver)
guessed Create a notification for this product.
Meta react-server-dom-turbopack Affected: 19.0.0 , ≤ 19.0.0 (semver)
Affected: 19.1.0 , ≤ 19.1.1 (semver)
Affected: 19.2.0 , ≤ 19.2.0 (semver)
guessed Create a notification for this product.
Meta react-server-dom-parcel Affected: 19.0.0 , ≤ 19.0.0 (semver)
Affected: 19.1.0 , ≤ 19.1.1 (semver)
Affected: 19.2.0 , ≤ 19.2.0 (semver)
guessed Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2025-55182

Status: Confirmed

Status Updated: 2025-12-05 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2025-12-05
Asserted: 2025-12-05

Scope
Notes: Meta React Server Components Remote Code Execution Vulnerability | Affected: Meta / React Server Components | Description: Meta React Server Components contains a remote code execution vulnerability that could allow unauthenticated remote code execution by exploiting a flaw in how React decodes payloads sent to React Server Function endpoints. Please note CVE-2025-66478 has been rejected, but it is associated with CVE-2025- 55182. | 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. | Due date: 2025-12-12 | Known ransomware campaign use (KEV): Known | Notes (KEV): Check for signs of potential compromise on all internet accessible REACT instances after applying mitigations. For more information, please see: https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components ; https://github.com/vercel-labs/fix-react2shell-next?tab=readme-ov-file ; https://nvd.nist.gov/vuln/detail/CVE-2025-55182

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev


Details
Cwes
Feed CISA Known Exploited Vulnerabilities Catalog
Product React Server Components
Due Date 2025-12-12
Date Added 2025-12-05
Vendorproject Meta
Vulnerabilityname Meta React Server Components Remote Code Execution Vulnerability
Knownransomwarecampaignuse Known

References

Created: 2026-02-02 12:25 UTC | Updated: 2026-11-04 13:37 UTC
ENISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2025-55182

Status: Confirmed

Status Updated: 2026-04-08 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2026-04-08
Asserted: 2026-04-08

Scope
Notes: Affected: Meta / React Server Components | Description: Flaw in how React decodes payloads sent to React Server Function endpoints enabled unauthenticated remote code execution. Apps supporting React Server Components may still be vulnerable even if not implementing any React Server Function endpoints. | Patched since: 2025/12/03 | Exploitation type: APT | Origin source: CNW | Notes: https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components#update-instructions

Evidence

Type: Csirt Report

Signal: Successful Exploitation

Confidence: 75%

Source: enisa-cnw-kev


Details
Cwes
Euvd EUVD-2025-2009839
Notes https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components#update-instructions
Catalog ENISA / EU CSIRTs Network (CNW) KEV JSON
Product React Server Components
Datereported 2026/04/08
Originsource CNW
Patchedsince 2025/12/03
Vendorproject Meta
Exploitationtype APT
Vulnerabilityname
Threatactorsexploiting

References

Created: 2026-06-05 17:04 UTC | Updated: 2026-11-04 13:00 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2025-55182

Status: Confirmed

Status Updated: 2026-11-12 00:00 UTC

Exploited: Yes


Characteristics
Severity: 100.0

Timestamps
First Seen: 2025-12-08
Asserted: 2025-12-08
Last Seen: 2026-11-12

Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Meta / React Server Components | Class: web-app-framework | Severity: Critical (CVSS 10) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-11-12: 17952

Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver


Details
1D 37
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class web-app-framework
7D Avg 96
Vendor Meta
30D Avg 79
90D Avg 149
Product React Server Components
Cisa Kev yes
Connections 17952
Observation Date 2026-11-12
Vulnerability Class CVSS
Vulnerability Score 10
Vulnerability Severity Critical

References

Created: 2026-06-30 09:22 UTC | Updated: 2026-11-14 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2025-55182

Status: Confirmed

Status Updated: 2026-06-01 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01

Scope
Notes: KEVIntel entry: 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... | Affected: Meta / react-server-dom-webpack, react-server-dom-turbopack, react-server-dom-parcel | CVSS: 10.0 (CRITICAL) | EPSS: 0.99562 | Used in malware: yes | Not yet in CISA KEV: False

Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title 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...
Vendor Meta
Product react-server-dom-webpack, react-server-dom-turbopack, react-server-dom-parcel
Added Date 2026-06-01T00:00:00.000Z
Cvss Score 10.0
Epss Score 0.99562
Cvss Severity CRITICAL
Epss Percentile 0.99941
Used In Malware yes
Ahead Of Cisa Kev
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  "unit": "day"
}
Not Yet In Cisa Kev False

References

Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website

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}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Events included in the timeline

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.