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CVE-2025-55182

Meta React Server Components Remote Code Execution

10.0 CRITICALActively exploited (CISA KEV)Used in ransomwareEPSS 99.8%
  1. Published3 Dec 2025
  2. Added to CISA KEV5 Dec 2025
  3. Remediation due12 Dec 2025
Actively exploited (CISA KEV)

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.

Added to KEV: 5 Dec 2025Federal remediation due: 12 Dec 2025Used in ransomware

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Facebook React19.0.0 · 19.1.0 · 19.1.1 · 19.2.0
Vercel Next.js14.3.0 · 15.6.0 · 16.0.0 · ≥ 15.0.0 < 15.0.5

Remediation

Fixed in
Vercel Next.js≥ 15.0.5

References

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Frequently asked

Is CVE-2025-55182 being actively exploited?

Yes. CVE-2025-55182 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 5 Dec 2025. It has been used in ransomware campaigns.

How severe is CVE-2025-55182?

CVE-2025-55182 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 99.8% probability of exploitation.

Which products are affected by CVE-2025-55182?

Affected products include Facebook React, Vercel Next.js.

How do I fix CVE-2025-55182?

Upgrade affected software to a fixed version, for example Vercel Next.js 15.0.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-55182 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.