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CVE-2025-55182: Meta React Server Components Remote Code Execution Vulnerability

criticalknown exploitedpublic exploitCVE-2025-55182
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Metaproduct: React Server ComponentsRemote code execution
What
Meta React Server Components contains a remote code execution vulnerability that could allow unauthenticated remote code execution.
Who is affected
Users of React Server Components with vulnerable versions exposed after public proof of concept release.
Urgency
Remediation is extremely urgent due to confirmed exploitation and critical severity.
Action
Update to the patched version of React Server Components.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-12-05
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-55182

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-55182coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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