CVE-2025-55182: in the CISA KEV catalogue

Meta React Server Components Remote Code Execution Vulnerability. CISA added CVE-2025-55182 to the Known Exploited Vulnerabilities catalogue on 2025-12-05 with a default due date of 2025-12-12. Known ransomware campaign use: Known. Forensic triage flag: No.

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. (CISA description)

Vendor / product: Meta React Server Components
CWE: Not listed
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.
EPSS: 100%, percentile 99 (scored 2026-11-03)

EPSS puts nearly every time in 100 odds (100%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.

Vendor and reference links (from CISA)

Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.

Data dates. CISA KEV catalogue version 2026.11.03, released 2026-11-03, 1,767 entries (checked 2026-11-03). EPSS model v2026.06.15, scored 2026-11-03, 399,388 CVEs. Sources: CISA and FIRST (EPSS by FIRST; scores generated by Empirical Security). Copied to our own database and refreshed automatically; if a refresh fails, the previous copy keeps serving with its own date.

Frequently asked questions

Is CVE-2025-55182 in the CISA KEV catalogue?

Yes. CISA added CVE-2025-55182 (Meta React Server Components Remote Code Execution Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2025-12-05. CISA's default due date for it is 2025-12-12.

Is CVE-2025-55182 used in ransomware attacks?

CISA marks known ransomware campaign use as Known for CVE-2025-55182.

What should I do about CVE-2025-55182?

CISA's 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.

Sources

CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
NVD record for CVE-2025-55182