Security readout for executives and security teams
CVE-2025-55182 is a critical pre-authentication remote code execution issue in React Server Components. Applications using affected 19.x React Server DOM packages may allow an unauthenticated attacker to reach Server Function endpoints and trigger unsafe deserialization from HTTP request data. Internet-facing React applications are most exposed if they use React Server Components with Server Function endpoints and depend on react-server-dom-webpack, react-server-dom-turbopack, or react-server-dom-parcel in the affected 19.x versions. Exposure is especially plausible where unauthenticated HTTP requests can reach those endpoints. Treat as an emergency remediation item for any internet-facing React Server Components application. The vulnerability is critical, unauthenticated, network exploitable, and reported as exploited by at least one bundled source URL, even though the bundle does not mark it as KEV-confirmed. Mitigation focus: Inventory applications for React Server Components usage and dependencies on react-server-dom-webpack, react-server-dom-turbopack, or react-server-dom-parcel.; Check the Meta/Facebook and React advisories in the source list for authoritative fixed versions or vendor workarounds, because the bundle does not provide patch-version evidence.; Prioritize upgrading or replacing affected packages once vendor-confirmed fixed versions are identified..
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-502: Code execution behavior lookup
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Open ATT&CK lookupExecution behavior lookup
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Open ATT&CK lookupCVE-2025-55182 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 10 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
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CISA KEV status
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H3.96Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
10CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.facebook.com/security/advisories/cve-2025-55182CVE reference · x_refsource_CONFIRM
- https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-componentsCVE reference · x_refsource_CONFIRM
- https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/CVE reference · media-coverage
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-55182CVE reference · government-resource
- https://news.ycombinator.com/item?id=46136026CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.