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Response snapshot Oct 27, 2026, 04:33 UTC

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VulnerabilityCVE-2025-55182Known exploitation

Meta React Server Components Remote Code Execution Vulnerability

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.

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
10.0 Critical (CVSS 3.1)
Chance of exploitation
99.8% in the next 30 days
CISA federal deadline
Dec 12, 2025: passed
Sources
2 independent sources

What to do

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Read CISA KEV entry CVE-2025-55182 (opens a new tab)

What happened

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 federal deadline

Federal due date passed

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Known
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

10.0

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

99.8%

Scored Percentile 100.0%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    CISA KEV entry CVE-2025-55182 (opens a new tab)

    The CVE-2025-55182 catalog entry establishes known exploitation, date added, required action, and the federal due date; not zero-day status.

    Published Checked

  2. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2025-55182, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

  3. Primary source

    CVE Program CNA Meta (opens a new tab)

    The published CVE-2025-55182 document's CNA supplies this CVSS 3.1 base score, vector, and authoritative source update date.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2025, December 5). Meta React Server Components Remote Code Execution Vulnerability (CVE-2025-55182). https://kevwire.com/record/CVE-2025-55182

MLA

"Meta React Server Components Remote Code Execution Vulnerability (CVE-2025-55182)." KEVWire, 5 Dec. 2025, kevwire.com/record/CVE-2025-55182.

Chicago

KEVWire. "Meta React Server Components Remote Code Execution Vulnerability (CVE-2025-55182)." Last modified December 5, 2025. https://kevwire.com/record/CVE-2025-55182.

Evidence summary (plain text)

Meta React Server Components Remote Code Execution Vulnerability (Dec 5, 2025).
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.
CVSS 10.0 (version 3.1; evidence as of Dec 11, 2025; https://cveawg.mitre.org/api/cve/CVE-2025-55182).
EPSS 99.8% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2025-55182&date=2026-10-26).
Sources:
CISA KEV entry CVE-2025-55182: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2025-55182&date=2026-10-26
CVE Program CNA Meta: https://cveawg.mitre.org/api/cve/CVE-2025-55182
Record ID: CVE-2025-55182.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
CISA federal due date: Dec 12, 2025. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was ingested from a data source. Retrieved: Oct 27, 2026, 01:40 UTC. Ingestion is not an independent editorial investigation.

CISA added this entry on 2025-12-05. This record's publication date is the catalog addition date, not necessarily the initial vulnerability disclosure. KEV means known exploitation, not necessarily a zero-day. CISA due dates apply to covered US federal agencies, not your organizational SLA.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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