{"basis":"claimed","id":"CVE-2025-55183","name":"Meta react-server-dom-webpack","vendorProject":"Meta","product":"react-server-dom-webpack","publishedAt":"2025-12-11","cvss":{"score":5.3,"severity":"MEDIUM","version":"3.1"},"exploited":null,"epss":{"score":0.64233,"percentile":0.99231,"date":"2026-11-02"},"coverage":{"cloudflare":{"status":"blocks","firstOn":"2025-12-11","daysToRule":null},"aws":{"status":"none","firstOn":null,"daysToRule":null},"azure":{"status":"none","firstOn":null,"daysToRule":null},"google":{"status":"none","firstOn":null,"daysToRule":null},"fastly":{"status":"no_history","firstOn":null,"daysToRule":null},"f5":{"status":"rule","firstOn":"2025-12-12","daysToRule":1},"akamai":{"status":"no_source","firstOn":null,"daysToRule":null},"crs":{"status":"none","firstOn":null,"daysToRule":null}},"title":null,"description":"An information leak vulnerability exists in specific configurations of React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. A specifically crafted HTTP request sent to a vulnerable Server Function may unsafely return the source code of any Server Function. Exploitation requires the existence of a Server Function which explicitly or implicitly exposes a stringified argument.","cwes":[],"vendors":[{"vendor":"cloudflare","status":"blocks","basis":"claimed","firstOn":"2025-12-11","firstIsNew":false,"daysToRule":null,"daysAtMost":0,"freePlan":true,"claims":[{"id":"917f3840fcfc36835a7af4532a68fe8b2d44b9d2c5edeb314ba8163e6014fbb8","cve_id":"CVE-2025-55183","vendor":"cloudflare","product":"Cloudflare Managed Ruleset","rule_id":"17c5123f1ac049818765ebf2fefb4e9b","rule_name":"React - Leaking Server Functions - CVE:CVE-2025-55183","change":"updated","default_action":"Block","published_on":"2025-12-11","source_url":"https://developers.cloudflare.com/changelog/post/2025-12-11-emergency-waf-release/","source_title":"WAF Release - 2025-12-11 - Emergency","excerpt":"React - Leaking Server Functions - CVE:CVE-2025-55183. Previous action: N/A. New action: Block. This was labeled as Generic - Server Function Source Code Exposure.","first_seen_at":"2026-11-02T21:00:15.584Z"},{"id":"8e58d21f9c40293283be6c159939b306e58f70d65da0573479d41474c90489ec","cve_id":"CVE-2025-55183","vendor":"cloudflare","product":"Cloudflare Free Ruleset","rule_id":"3114709a3c3b4e3685052c7b251e86aa","rule_name":"React - Leaking Server Functions - CVE:CVE-2025-55183","change":"updated","default_action":"Block","published_on":"2025-12-11","source_url":"https://developers.cloudflare.com/changelog/post/2025-12-11-emergency-waf-release/","source_title":"WAF Release - 2025-12-11 - Emergency","excerpt":"React - Leaking Server Functions - CVE:CVE-2025-55183. Previous action: N/A. New action: Block. This was labeled as Generic - Server Function Source Code Exposure.","first_seen_at":"2026-11-02T21:00:15.584Z"}]},{"vendor":"aws","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"azure","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"google","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"fastly","status":"no_history","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"f5","status":"rule","basis":"claimed","firstOn":"2025-12-12","firstIsNew":true,"daysToRule":1,"daysAtMost":null,"freePlan":false,"claims":[{"id":"2a5cdedd9917f77d20859b3798318d721f459e743a518930f5f5880c0d15a552","cve_id":"CVE-2025-55183","vendor":"f5","product":"Attack signatures","rule_id":"200009348","rule_name":"Next.js Server Function Code Exposure","change":"new","default_action":null,"published_on":"2025-12-12","source_url":"https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog","source_title":"F5 Distributed Cloud attack signatures changelog","excerpt":"Added: signature 200009348 \"Next.js Server Function Code Exposure\" (Information Leakage, risk Medium), systems: Node.js, JavaScript, ReactJS. References: CVE-2025-55183.","first_seen_at":"2026-11-02T21:00:28.819Z"}]},{"vendor":"akamai","status":"no_source","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"crs","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]}],"updatedAt":"2026-11-02T21:17:16.518Z","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial"},"measured":[],"social":{"total":0,"first_seen":null,"daily":[{"day":"2026-10-21","posts":0},{"day":"2026-10-22","posts":0},{"day":"2026-10-23","posts":0},{"day":"2026-10-24","posts":0},{"day":"2026-10-25","posts":0},{"day":"2026-10-26","posts":0},{"day":"2026-10-27","posts":0},{"day":"2026-10-28","posts":0},{"day":"2026-10-29","posts":0},{"day":"2026-10-30","posts":0},{"day":"2026-10-31","posts":0},{"day":"2026-11-01","posts":0},{"day":"2026-11-02","posts":0},{"day":"2026-11-03","posts":0}],"top_posts":[],"exploit_repositories":[]}}