{"basis":"claimed","id":"CVE-2026-75604","name":"Next.js: Unauthenticated Remote Code Execution on windows-hosted servers","vendorProject":"vercel","product":"next.js","publishedAt":"2026-09-01","cvss":{"score":9,"severity":"CRITICAL","version":"3.1"},"exploited":null,"epss":{"score":0.02105,"percentile":0.8174,"date":"2026-11-02"},"coverage":{"cloudflare":{"status":"blocks","firstOn":"2026-08-26","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":"2026-09-16","daysToRule":15},"akamai":{"status":"no_source","firstOn":null,"daysToRule":null},"crs":{"status":"none","firstOn":null,"daysToRule":null}},"title":"Next.js: Unauthenticated Remote Code Execution on windows-hosted servers","description":"Next.js is a React framework for building full-stack web applications. From 13.4.0 until 15.5.24 and 16.3.3, Next.js applications using Pages Router or App Router without Cache Components on Windows-hosted servers do not consistently escape backslashes in route segments before constructing incremental-cache paths. In packages/next/src/shared/lib/router/utils/escape-path-delimiters.ts and packages/next/src/server/lib/incremental-cache/file-system-cache.ts, a remote request can supply encoded Windows path separators that traverse outside the intended cache root and expose private build data, including the server-reference-manifest encryption key. Disclosure of that key can enable remote code execution in the affected application. This issue is fixed in versions 15.5.24 and 16.3.3.","cwes":["CWE-22"],"vendors":[{"vendor":"cloudflare","status":"blocks","basis":"claimed","firstOn":"2026-08-26","firstIsNew":false,"daysToRule":null,"daysAtMost":-6,"freePlan":false,"claims":[{"id":"7f87629aac507f8dd4374e9a930d4df54f7bb31d37a621adbda70b52d27f042e","cve_id":"CVE-2026-75604","vendor":"cloudflare","product":"Cloudflare Managed Ruleset","rule_id":"2b6b94ec864d47f99630ecf72ca6cce3","rule_name":"Next.js - Remote Code Execution - CVE:CVE-2026-75604","change":"updated","default_action":null,"published_on":"2026-08-26","source_url":"https://developers.cloudflare.com/changelog/post/2026-08-26-emergency-waf-release/","source_title":"WAF Release - 2026-08-26 - Emergency","excerpt":"Next.js - Remote Code Execution - CVE:CVE-2026-75604. Previous action: Block. New action: N/A. Rule metadata description refined. Detection unchanged.","first_seen_at":"2026-11-02T21:00:15.176Z"},{"id":"fe023c7a086b0b87b66506e13d05938080253da8ad8897d9c05b2c87fe712e13","cve_id":"CVE-2026-75604","vendor":"cloudflare","product":"Cloudflare Managed Ruleset","rule_id":"771ac3761dcd485cb0e91ea0208457cf","rule_name":"Next.js - Remote Code Execution - CVE:CVE-2026-75604 - Beta","change":"updated","default_action":"Block","published_on":"2026-09-08","source_url":"https://developers.cloudflare.com/changelog/post/2026-09-08-waf-release/","source_title":"WAF Release - 2026-09-08","excerpt":"Next.js - Remote Code Execution - CVE:CVE-2026-75604 - Beta. Previous action: Log. New action: Block. This rule is merged into the original rule \"Next.js - Remote Code Execution - CVE:CVE-2026-75604\" (ID: ...2ca6cce3 ).","first_seen_at":"2026-11-02T21:00:15.176Z"}]},{"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":"2026-09-16","firstIsNew":true,"daysToRule":15,"daysAtMost":null,"freePlan":false,"claims":[{"id":"1e310aef56734ee048661f1328ab18bed50642425814b1bfa84858d5cbd4983a","cve_id":"CVE-2026-75604","vendor":"f5","product":"Attack signatures","rule_id":"200007122","rule_name":"Next.js ISR Remote Code Execution","change":"new","default_action":null,"published_on":"2026-09-16","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 200007122 \"Next.js ISR Remote Code Execution\" (Path Traversal, risk High), systems: Node.js. References: CVE-2026-75604.","first_seen_at":"2026-11-02T21:00:23.977Z"}]},{"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:H/PR:N/UI:N/S:C/C:H/I:H/A:H","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total"},"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":[]}}