{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-100409", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-25T20:08:33.084Z", "datePublished": "2026-10-15T16:57:50.999Z", "dateUpdated": "2026-10-15T17:50:33.255Z"}, "containers": {"cna": {"title": "OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths", "problemTypes": [{"descriptions": [{"cweId": "CWE-177", "lang": "en", "description": "CWE-177: Improper Handling of URL Encoding (Hex Encoding)", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-180", "lang": "en", "description": "CWE-180: Incorrect Behavior Order: Validate Before Canonicalize", "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/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6"}, {"name": "https://github.com/opennextjs/opennextjs-aws/pull/1199", "tags": ["x_refsource_MISC"], "url": "https://github.com/opennextjs/opennextjs-aws/pull/1199"}, {"name": "https://github.com/opennextjs/opennextjs-aws/pull/1200", "tags": ["x_refsource_MISC"], "url": "https://github.com/opennextjs/opennextjs-aws/pull/1200"}, {"name": "https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b", "tags": ["x_refsource_MISC"], "url": "https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b"}, {"name": "https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2", "tags": ["x_refsource_MISC"], "url": "https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2"}], "affected": [{"vendor": "opennextjs", "product": "opennextjs-cloudflare", "versions": [{"version": ">= 0.3.0, < 1.20.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-15T16:57:50.999Z"}, "descriptions": [{"lang": "en", "value": "OpenNext Cloudflare is an open Next.js adapter for Cloudflare. From 0.3.0 until 1.20.2, applications that enable enableCacheInterception, rely on middleware for access control, and have a matching cached protected route process encoded pathnames inconsistently between middleware matching and cache lookup. An unauthenticated attacker can use a percent-encoded pathname that does not match authorization middleware but decodes to the cache key of a protected route, causing cached content to be returned without authorization. Malformed encodings can also be partially decoded, allowing cache lookup to continue with a pathname that middleware did not evaluate consistently. This issue is fixed in version 1.20.2."}], "source": {"advisory": "GHSA-2vc4-c4r6-p6v6", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-15T17:50:22.601978Z", "id": "CVE-2026-100409", "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": "2026-10-15T17:50:33.255Z"}}]}}

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{"affected": [{"affectedData": [{"product": "opennextjs-cloudflare", "vendor": "opennextjs", "versions": [{"status": "affected", "version": ">= 0.3.0, < 1.20.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenNext Cloudflare is an open Next.js adapter for Cloudflare. From 0.3.0 until 1.20.2, applications that enable enableCacheInterception, rely on middleware for access control, and have a matching cached protected route process encoded pathnames inconsistently between middleware matching and cache lookup. An unauthenticated attacker can use a percent-encoded pathname that does not match authorization middleware but decodes to the cache key of a protected route, causing cached content to be returned without authorization. Malformed encodings can also be partially decoded, allowing cache lookup to continue with a pathname that middleware did not evaluate consistently. This issue is fixed in version 1.20.2."}], "id": "CVE-2026-100409", "lastModified": "2026-10-15T17:17:07.923", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-15T17:17:07.923", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/opennextjs/opennextjs-aws/pull/1199"}, {"source": "security-advisories@github.com", "url": "https://github.com/opennextjs/opennextjs-aws/pull/1200"}, {"source": "security-advisories@github.com", "url": "https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b"}, {"source": "security-advisories@github.com", "url": "https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-177"}, {"lang": "en", "value": "CWE-180"}], "source": "security-advisories@github.com", "type": "Primary"}]}

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