Unauthenticated code execution via unsafe Flight deserialization
Published Dec 3, 2025 · Updated Aug 4, 2026
Unsafe deserialization in Meta React Server Components 19.0.0, 19.1.0, 19.1.1, and 19.2.0 allows remote attackers to execute code. The Flight decoder rebuilds attacker-controlled object references from multipart form fields, permitting prototype-chain traversal to the Function constructor. Any server application using an affected package with React Server Components support is exposed through crafted HTTP requests, even when it defines no Server Functions.
Summary
What happened
Unsafe deserialization in Meta React Server Components 19.0.0, 19.1.0, 19.1.1, and 19.2.0 allows remote attackers to execute code. The Flight decoder rebuilds attacker-controlled object references from multipart form fields, permitting prototype-chain traversal to the Function constructor. Any server application using an affected package with React Server Components support is exposed through crafted HTTP requests, even when it defines no Server Functions.
The record
- CVE
- CVE-2025-55182
- Published
- Dec 3, 2025
- Updated
- Aug 4, 2026
- Vendor
- Meta Platforms, Inc.
- Product
- react-server-dom-parcel
- Classifications
- CWE-502, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 3, 2025CVE publishedPublication date reported by the CVE source.
- Dec 4, 2025Exploitation reportedEarth Lamia and Jackpot Panda exploitation attempts
- Dec 5, 2025Exploitation reportedCISA Known Exploited Vulnerabilities catalog inclusion
- Aug 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=19.0.0 <=19.0.0
- Affected versionversion=19.1.0 <=19.1.1
- Affected versionversion=19.2.0 <=19.2.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
View daily counts
| Reporting day | Unique IPs |
|---|---|
| Sep 10, 2026 | 321 |
| Sep 11, 2026 | 564 |
| Sep 12, 2026 | 57 |
| Sep 13, 2026 | 57 |
| Sep 14, 2026 | 82 |
| Sep 15, 2026 | 81 |
| Sep 16, 2026 | 119 |
Weakness, pattern, technique
Public exploit references
- CVE-2025-55182 React Server Components RCE proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- Earth Lamia and Jackpot Panda exploitation attemptsthreat actor
- CISA Known Exploited Vulnerabilities catalog inclusionknown exploited catalog
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo