{"id":"CVE-2025-55182","published":"2025-12-03T16:15:56Z","modified":"2026-10-18T17:10:00Z","title":"Meta React Server Components Remote Code Execution Vulnerability","vendor":"Meta","product":"React Server Components","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"The flaw is an unsafe deserialization of untrusted data in Meta's React Server Components, affecting the react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack packages, where HTTP request payloads sent to Server Function endpoints are deserialized without adequate checks. An unauthenticated remote attacker with network access can send a crafted request to a Server Function endpoint to achieve remote code execution, requiring no privileges, no user interaction and no non-default configuration.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T06:51:51Z"},"cvss":{"score":10.0,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.99802,"percentile":0.99958,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2025-12-05","dueDate":"2025-12-12","ransomware":true,"requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"Check for signs of potential compromise on all internet accessible REACT instances after applying mitigations. For more information, please see: https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components ; https://github.com/vercel-labs/fix-react2shell-next?tab=readme-ov-file ; https://nvd.nist.gov/vuln/detail/CVE-2025-55182","provenance":"source"},"vulncheckKev":{"dateAdded":"2025-12-03","exploitedFirstSeen":"2025-12-03","ransomware":true,"evidence":[{"url":"https://www.cybereason.com/blog/cve-2025-55182-rce-vulnerability","date":"2025-12-03"},{"url":"https://aws.amazon.com/blogs/security/china-nexus-cyber-threat-groups-rapidly-exploit-react2shell-vulnerability-cve-2025-55182/","date":"2025-12-04"},{"url":"https://app.crowdsec.net/cti/cve-explorer/CVE-2025-55182","date":"2025-12-05"},{"url":"https://fortiguard.fortinet.com/outbreak-alert/react2shell-rce","date":"2025-12-05"},{"url":"https://securitylabs.datadoghq.com/articles/cve-2025-55182-react2shell-remote-code-execution-react-server-components/#exploitation-activity-in-the-wild","date":"2025-12-05"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2025-12-05"},{"url":"https://www.greynoise.io/blog/cve-2025-55182-react2shell-opportunistic-exploitation-in-the-wild-what-the-greynoise-observation-grid-is-seeing-so-far","date":"2025-12-05"},{"url":"https://x.com/DefusedCyber/status/1996970968661594119?s=20","date":"2025-12-05"},{"url":"https://x.com/dez_/status/1997024020131434982?s=20","date":"2025-12-05"},{"url":"https://defusedcyber.com/react2shell-exploitation-honeypot-analysis","date":"2025-12-07"}],"evidenceTotal":442,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Hunting Leaked PHP2Shell RCE Across Open Directories (CVE-2026-109618, CVE-2026-109619)","url":"https://otx.alienvault.com/pulse/6ae253860a3b367f68c51cd8","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"EbeeOct2026 Pt5","url":"https://otx.alienvault.com/pulse/6ae189b2042138c108f4126b","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 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allowing the group to leverage remote code execution (RCE) within vulnerable cloud endpoints.","start":4102,"end":4267},{"quote":"CVE-2025-55182","start":25534,"end":25548}]},{"id":"SRC-6456fe61781512dde412","title":"MuddyWater Exposed: Inside an Iranian APT operation - Ctrl-Alt-Intel","publisher":"ctrlaltintel.com","url":"https://ctrlaltintel.com/research/MuddyWater/","date":"2026-03-04","mentions":[{"quote":"CVE-2025-55182 - React2Shell","start":4114,"end":4142}]},{"id":"SRC-ed57acf6923aa63f6b98","title":"Bitdefender Labs","publisher":"bitdefender.com","url":"https://www.bitdefender.com/en-us/blog/labs/","date":null,"mentions":[{"quote":"CVE-2025-55182 Exploitation Hits the Smart Home Whitepapers","start":1195,"end":1254}]},{"id":"SRC-5629a83b43d088761158","title":"260702","publisher":"ic3.gov","url":"https://www.ic3.gov/CSA/2026/260702.pdf","date":null,"mentions":[{"quote":"CVE-2026-45321 CVE-2025-55182","start":5384,"end":5413}]},{"id":"SRC-3cdab069b9896987972b","title":"LightSpy Malware Variant Targeting macOS","publisher":"huntress.com","url":"https://www.huntress.com/blog/lightspy-malware-variant-targeting-macos","date":null,"mentions":[{"quote":"PeerBlight Linux Backdoor Exploits React2Shell CVE-2025-55182Huntress is seeing threat actors exploit React2Shell (CVE-2025-55182) to deploy a Linux backdoor, a reverse proxy tunnel, and a Go-based post-exploitation implant.Learn More","start":9743,"end":9977}]}],"affected":[{"ecosystem":"npm","package":"react-server-dom-webpack","vulnerableRanges":[">=19.0.0, <19.0.1",">=19.1.0, <19.1.2",">=19.2.0, <19.2.1"],"patched":["19.0.1","19.1.2","19.2.1"],"from":["GHSA-fv66-9v8q-g76r"],"provenance":"source"},{"ecosystem":"npm","package":"react-server-dom-turbopack","vulnerableRanges":[">=19.0.0, <19.0.1",">=19.1.0, <19.1.2",">=19.2.0, <19.2.1"],"patched":["19.0.1","19.1.2","19.2.1"],"from":["GHSA-fv66-9v8q-g76r"],"provenance":"source"},{"ecosystem":"npm","package":"react-server-dom-parcel","vulnerableRanges":[">=19.0.0, 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<19.2.1"],"patched":["19.2.1"],"provenance":"source","from":"GHSA"}],"euvd":{"id":"EUVD-2025-200983","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-200983","exploited":true,"exploitedSince":"2025-12-05","provenance":"source"},"exploits":[{"id":52506,"url":"https://www.exploit-db.com/exploits/52506","title":"React Server 19.2.0 - Remote Code 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product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"packageHistory":[{"cve":"CVE-2025-55182","published":"2025-12-03","fixed":"19.2.1","kev":true},{"cve":"CVE-2025-55183","published":"2025-12-11","fixed":"19.2.2","kev":false,"link":{"from":"CVE-2025-55182","to":"CVE-2025-55183","relation":"successor","confidence":"low","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"npm:react-server-dom-webpack","fromFixed":"19.0.1","toFixed":"19.0.2","daysApart":8},{"kind":"version-step","provenance":"source","package":"npm:react-server-dom-turbopack","fromFixed":"19.0.1","toFixed":"19.0.2","daysApart":8}]}},{"cve":"CVE-2025-55184","published":"2025-12-11","fixed":"19.2.2","kev":false,"link":{"from":"CVE-2025-55182","to":"CVE-2025-55184","relation":"successor","confidence":"medium","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"npm:react-server-dom-webpack","fromFixed":"19.0.1","toFixed":"19.0.2","daysApart":8},{"kind":"version-step","provenance":"source","package":"npm:react-server-dom-turbopack","fromFixed":"19.0.1","toFixed":"19.0.2","daysApart":8},{"kind":"similar","provenance":"machine","score":0.66,"basis":"same 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