{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-44575","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-05-06T21:49:12.424Z","datePublished":"2026-05-13T16:54:39.455Z","dateUpdated":"2026-07-07T12:04:52.558Z"},"containers":{"cna":{"title":"Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes","problemTypes":[{"descriptions":[{"cweId":"CWE-288","lang":"en","description":"CWE-288: Authentication Bypass Using an Alternate Path or Channel","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f","tags":["x_refsource_CONFIRM"],"url":"https://github.com/vercel/next.js/security/advisories/GHSA-267c-6grr-h53f"}],"affected":[{"vendor":"vercel","product":"next.js","versions":[{"version":">= 16.0.0, < 16.2.5","status":"affected"},{"version":">= 15.2.0, < 15.5.16","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-05-13T16:54:39.455Z"},"descriptions":[{"lang":"en","value":"Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check. This vulnerability is fixed in 15.5.16 and 16.2.5."}],"source":{"advisory":"GHSA-267c-6grr-h53f","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T17:48:53.731472Z","id":"CVE-2026-44575","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-13T17:50:24.865Z"}},{"affected":[{"cpes":["cpe:/a:redhat:amq_streams:2.9::el9"],"defaultStatus":"affected","product":"Streams for Apache Kafka 2.9.4","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:enterprise_linux_ai:3"],"defaultStatus":"affected","product":"Red Hat Enterprise Linux AI (RHEL AI) 3","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:trusted_artifact_signer:1"],"defaultStatus":"affected","product":"Red Hat Trusted Artifact Signer","vendor":"Red Hat"},{"cpes":["cpe:/a:redhat:amq_streams:3"],"defaultStatus":"affected","product":"streams for Apache Kafka 3","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:10"],"defaultStatus":"unaffected","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:7"],"defaultStatus":"unaffected","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:8"],"defaultStatus":"unaffected","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat"},{"cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"unaffected","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"}],"datePublic":"2026-05-13T16:54:39.455Z","descriptions":[{"lang":"en","value":"A flaw was found in Next.js. App Router applications that use middleware or proxy-based authorization checks are vulnerable to unauthorized access. A remote attacker can exploit this by crafting specific .rsc and segment-prefetch URLs, which bypass the intended middleware rules. This allows access to protected content without proper authorization."}],"metrics":[{"other":{"content":{"namespace":"https://access.redhat.com/security/updates/classification/","value":"Important"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-551","description":"Incorrect Behavior Order: Authorization Before Parsing and Canonicalization","lang":"en","type":"CWE"}]}],"references":[{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-44575"},{"name":"RHBZ#2477188","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477188"},{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44575.json"},{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:34608"}],"solutions":[{"lang":"en","value":"RHSA-2026:34608: Streams for Apache Kafka 2.9.4"}],"timeline":[{"lang":"en","time":"2026-05-13T18:01:17.168Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-05-13T16:54:39.455Z","value":"Made public."}],"title":"next.js: Next.js: Unauthorized access to protected content via middleware bypass","workarounds":[{"lang":"en","value":"Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}],"x_adpType":"supplier","x_generator":{"engine":"sadp-cli 1.0.0"},"providerMetadata":{"orgId":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","shortName":"redhat-SADP","dateUpdated":"2026-07-07T12:04:52.558Z"}}]}}