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Fencer Vulns
critical 10.0

CVE-2025-55182 kev+ ransomware in the critical feed json

Next.js is vulnerable to RCE in React flight protocol

published 2025-12-03 11 mo ago modified 2026-10-18 21 d ago also EUVD-2025-200983 , GHSA-9qr9-h5gf-34mp , GHSA-fv66-9v8q-g76r

cvss
10.0
version 3.1, CNA
cisa kev
Exploited
added 2025-12-05, used in ransomware
epss
99.7%
EPSS 99.7% chance of exploitation in 30 days, percentile 99.9%
public exploits
2
Metasploit, Exploit-DB, plus a Nuclei check

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.

Patch / fix

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.

  • npm next 15.0.5, 15.1.9, 15.2.6, 15.3.6, 15.4.8, 15.5.7, 16.0.7
  • npm react-server-dom-webpack 19.0.1, 19.1.2, 19.2.1
  • npm react-server-dom-turbopack 19.0.1, 19.1.2, 19.2.1
  • npm react-server-dom-parcel 19.0.1, 19.1.2, 19.2.1
  • vercel next.js 13.5.1
  • facebook react 19.0.1, 19.1.2, 19.2.1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-55182 updated cvss 10.0

next: React Server Components: Pre-authentication remote code execution via unsafe deserialization

  • Red Hat Enterprise Linux 7 firefox Red Hat Enterprise Linux 8 firefox, thunderbird Red Hat Enterprise Linux 9 firefox, dotnet7.0, dotnet-host, firefox-x11, thunderbird, dotnet-sdk-7.0, +9 more Red Hat Enterprise Linux 10 firefox, thunderbird Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/disk-image-cuda-rhel9
    not affected: vulnerable code not present
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-dashboard-rhel9
    not affected: vulnerable code not in execute path
  • Red Hat Trusted Artifact Signer rhtas/rekor-search-ui-rhel9 Red Hat streams for Apache Kafka 2 com.github.streamshub-console Red Hat streams for Apache Kafka 3 com.github.streamshub-console
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (Metasploit exploit/multi/http/react2shell_unauth_rce_cve_2025_55182)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
11 mo ago
Patch by
2025-12-12 (10 mo ago)
Ransomware
Known to be used in ransomware campaigns
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, product
Meta, React Server Components
CISA name
Meta React Server Components Remote Code Execution Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
3 mo ago

Exploit prediction

99.73% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CNA 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
GitHub 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm next
>=14.3.0-canary.77, <15.0.5
>=15.1.0-canary.0, <15.1.9
>=15.2.0-canary.0, <15.2.6
>=15.3.0-canary.0, <15.3.6
>=15.4.0-canary.0, <15.4.8
>=15.5.0-canary.0, <15.5.7
>=16.0.0-canary.0, <16.0.7
15.0.5
15.1.9
15.2.6
15.3.6
15.4.8
15.5.7
16.0.7
npm react-server-dom-webpack
>=19.0.0, <19.0.1
>=19.1.0, <19.1.2
>=19.2.0, <19.2.1
19.0.1
19.1.2
19.2.1
npm react-server-dom-turbopack
>=19.0.0, <19.0.1
>=19.1.0, <19.1.2
>=19.2.0, <19.2.1
19.0.1
19.1.2
19.2.1
npm react-server-dom-parcel
>=19.0.0, <19.0.1
>=19.1.0, <19.1.2
>=19.2.0, <19.2.1
19.0.1
19.1.2
19.2.1

Affected products

  • Meta react-server-dom-webpack
  • Meta react-server-dom-turbopack
  • Meta react-server-dom-parcel

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of vercel/next.js published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.