{"schemaVersion":3,"id":"CVE-2026-100409","aliases":["GHSA-2vc4-c4r6-p6v6"],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-10-15T16:57:50.999Z","modified":"2026-10-15T17:50:33.255Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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Handling of URL Encoding (Hex Encoding)","description":"The product does not properly handle when all or part of an input has been URL encoded.","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/177.html"},{"id":"CWE-180","name":"Incorrect Behavior Order: Validate Before Canonicalize","description":"The product validates input before it is canonicalized, which prevents the product from detecting data that becomes invalid after the canonicalization step.","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/180.html"}],"affected":[{"vendor":"@opennextjs","product":"cloudflare","name":"@opennextjs/cloudflare","label":"cloudflare","ecosystem":"Npm","cpePart":null,"purl":"pkg:npm/@opennextjs/cloudflare","purlType":"npm","versions":[{"text":"≥ 0.3.0, < 1.20.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 0.3.0, < 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MISC","WEB"]},{"url":"https://github.com/opennextjs/opennextjs-aws/pull/1200","label":"github.com/opennextjs/opennextjs-aws/pull/1200","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b","label":"github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2","label":"github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100409","label":"nvd.nist.gov/vuln/detail/CVE-2026-100409","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/opennextjs/opennextjs-cloudflare","label":"github.com/opennextjs/opennextjs-cloudflare","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-15T16:57:50.999Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-15T17:50:33.255Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T07:34:51.084Z","stale":false,"partial":false}}