CVE-2025-55182 Meta React Server Components: command or code injection
In plain words: The program treats text it receives as instructions instead of plain data. The attacker can run commands on the machine — often the whole device is taken over.
Confirmed exploited by CISA on · US federal patch deadline Dec 12, 2025
What to do
- Install Meta's security update for React Server Components. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Meta React Server Components Remote Code Execution Vulnerability
- Product
- Meta React Server Components
- CISA 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.
- Type of flaw
- Command or code injection
- Confirmed exploited
- Dec 5, 2025 — known to be used in ransomware attacks
- US federal patch deadline
- Dec 12, 2025
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Answering about CVE-2025-55182 ·
Questions about CVE-2025-55182
Is CVE-2025-55182 being exploited?
Yes. CISA added CVE-2025-55182 to its Known Exploited Vulnerabilities catalog on Dec 5, 2025, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2025-55182?
Install Meta's security update for React Server Components. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2025-55182?
Only if you use Meta React Server Components. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.