CVE-2025-55182

CRITICALNVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score elevated to 10.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-12-05), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 10.0 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, nvd
Exploited in the wild
10.0
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 100%CVSS: 10.0Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
10.0
EG Score
10.0(high)
EG Risk
—
EPSS
99.9%
KEV
⚠ Exploited

Published

December 3, 2025

Last Modified

December 10, 2025

Advisory Details (6)

Auto-updated Jul 18, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182
generic

China-nexus cyber threat groups rapidly exploit React2Shell vulnerability (CVE-2025-55182) | AWS Security Blog

https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/
generic🔴 Active Exploitation

RCE Vulnerability in React and Next.js | Hacker News

https://news.ycombinator.com/item?id=46136026
generic

oss-security - CVE-2025-55182: RCE in React Server Components

http://www.openwall.com/lists/oss-security/2025/12/03/4
generic

CVE-2025-55182

https://www.facebook.com/security/advisories/cve-2025-55182
generic

Critical Security Vulnerability in React Server Components – React

https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components

Vendor Advisories for CVE-2025-55182(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 1 ecosystem)
npm(3)
PackageVulnerable rangeFixed inDependents
react-server-dom-parcel19.2.019.2.1—
react-server-dom-turbopack19.2.019.2.1—
react-server-dom-webpack19.2.019.2.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 18× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:24 UTCEG score recompute
  2. 2026-07-22 19:40 UTCCISA KEV update
  3. 2026-07-21 14:37 UTCCISA KEV update
  4. 2026-07-17 08:20 UTCEG score recompute
  5. 2026-07-16 17:04 UTCCISA KEV update
  6. 2026-07-15 16:49 UTCCISA KEV update
  7. 2026-07-15 15:04 UTCCISA KEV update
  8. 2026-07-14 18:05 UTCCISA KEV update
  9. 2026-07-13 17:07 UTCCISA KEV update
  10. 2026-07-10 17:52 UTCCISA KEV update
  11. 2026-07-07 19:01 UTCCISA KEV update
  12. 2026-07-07 17:16 UTCCISA KEV update
  13. 2026-07-06 16:27 UTCEPSS rescore
  14. 2026-07-06 16:27 UTCEPSS rescore
  15. 2026-07-01 19:16 UTCCISA KEV update
  16. 2026-06-29 19:12 UTCCISA KEV update
  17. 2026-06-25 19:15 UTCCISA KEV update
  18. 2026-06-23 17:44 UTCCISA KEV update
  19. 2026-06-18 16:13 UTCCISA KEV update
  20. 2026-06-16 19:33 UTCCISA KEV update
  21. 2026-06-15 19:33 UTCCISA KEV update
  22. 2026-06-15 17:48 UTCEPSS rescore
  23. 2026-06-14 23:17 UTCEPSS rescore
  24. 2026-06-12 23:11 UTCEPSS rescore
  25. 2026-06-12 17:35 UTCCISA KEV update
Show 28 more
  1. 2026-06-11 19:10 UTCCISA KEV update
  2. 2026-06-11 14:00 UTCEPSS rescore
  3. 2026-06-11 14:00 UTCEPSS rescore
  4. 2026-06-10 22:18 UTCEPSS rescore
  5. 2026-06-10 22:18 UTCEPSS rescore
  6. 2026-06-09 18:42 UTCCISA KEV update
  7. 2026-06-09 17:12 UTCCISA KEV update
  8. 2026-06-08 19:16 UTCCISA KEV update
  9. 2026-06-08 17:26 UTCCISA KEV update
  10. 2026-06-08 14:16 UTCEPSS rescore
  11. 2026-06-08 14:16 UTCEPSS rescore
  12. 2026-06-07 15:24 UTCEPSS rescore
  13. 2026-06-07 15:24 UTCEPSS rescore
  14. 2026-06-06 13:47 UTCEPSS rescore
  15. 2026-06-06 13:47 UTCEPSS rescore
  16. 2026-06-05 22:46 UTCEPSS rescore
  17. 2026-06-05 22:46 UTCEPSS rescore
  18. 2026-06-05 22:43 UTCCISA KEV update
  19. 2026-06-05 06:10 UTCEPSS rescore
  20. 2026-06-05 06:10 UTCEPSS rescore
  21. 2026-06-03 19:09 UTCCISA KEV update
  22. 2026-06-02 20:12 UTCEPSS rescore
  23. 2026-06-02 20:12 UTCEPSS rescore
  24. 2026-06-02 18:32 UTCCISA KEV update
  25. 2026-06-01 20:42 UTCCISA KEV update
  26. 2026-05-29 22:20 UTCCISA KEV update
  27. 2026-05-29 18:30 UTCEG score recompute
  28. 2026-05-29 13:44 UTCEPSS rescore

Publicly available exploits

(10 references)

Working exploit code is in the public domain (9 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-52506
    First seen Apr 9, 2026

    React Server 19.2.0 - Remote Code Execution

    Open source ↗
  • GitHub PoCalptexans/RSC-Detect-CVE-2025-55182
    First seen Feb 25, 2026

    RSC Detect CVE 2025 55182

    Open source ↗
  • GitHub PoCemredavut/CVE-2025-55182
    First seen Dec 6, 2025

    RSC/Next.js RCE Vulnerability Detector & PoC Chrome Extension – CVE-2025-55182 & CVE-2025-66478

    Open source ↗
  • GitHub PoCzack0x01/CVE-2025-55182-advanced-scanner-
    First seen Dec 6, 2025
    Open source ↗
  • GitHub PoCynsmroztas/NextRce
    First seen Dec 6, 2025

    React Shell & Next.js RSC Exploit Tool (CVE-2025-55182)

    Open source ↗
  • GitHub PoClachlan2k/React2Shell-CVE-2025-55182-original-poc
    First seen Dec 5, 2025

    Original Proof-of-Concepts for React2Shell CVE-2025-55182

    Open source ↗
  • GitHub PoCmrknow001/RSC_Detector
    First seen Dec 5, 2025

    Supports RSC fingerprinting and exploitation of the React component vulnerability CVE-2025-55182.

    Open source ↗
  • GitHub PoCpyroxenites/Nextjs_RCE_Exploit_Tool
    First seen Dec 5, 2025

    Exploit for CVE-2025-55182 & CVE-2025-66478

    Open source ↗
  • GitHub PoCmsanft/CVE-2025-55182
    First seen Dec 4, 2025

    Explanation and full RCE PoC for CVE-2025-55182

    Open source ↗
  • GitHub PoCassetnote/react2shell-scanner
    First seen Dec 4, 2025

    High Fidelity Detection Mechanism for RSC/Next.js RCE (CVE-2025-55182 & CVE-2025-66478)

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2025-55182?
CVE-2025-55182 is a critical vulnerability published on December 3, 2025. 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…
When was CVE-2025-55182 disclosed?
CVE-2025-55182 was first published in the National Vulnerability Database on December 3, 2025, with the most recent update on December 10, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-55182 actively exploited?
Yes. CISA added CVE-2025-55182 to the Known Exploited Vulnerabilities catalog on December 5, 2025, affecting Meta React Server Components. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2025-55182?
CVE-2025-55182 has a CVSS v3 base score of 10.0 (NVD).
Which products are affected by CVE-2025-55182?
CVE-2025-55182 affects Meta React Server Components. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2025-55182?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-55182, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-55182

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