{"id":"CVE-2026-100409","title":"OpenNext Cloudflare is an open Next.js adapter for Cloudflare","summary":"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 p…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-177","CWE-180"],"vendor":"opennextjs","product":"opennextjs-cloudflare","affected":["opennextjs-cloudflare >= 0.3.0, < 1.20.2"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T18:17:21.500","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100409","references":[{"url":"https://github.com/opennextjs/opennextjs-aws/pull/1199","label":"security-advisories@github.com"},{"url":"https://github.com/opennextjs/opennextjs-aws/pull/1200","label":"security-advisories@github.com"},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b","label":"security-advisories@github.com"},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2","label":"security-advisories@github.com"},{"url":"https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100409"},{"url":"https://github.com/advisories/GHSA-2vc4-c4r6-p6v6"}],"tags":["nvd","cve.org","ghsa","npm"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-15T17:50:22.601978Z"},"ingestedAt":"2026-10-15T17:18:20.096Z","aliases":["GHSA-2vc4-c4r6-p6v6"],"ecosystem":"npm","patched":["@opennextjs/cloudflare 1.20.2"],"slug":"CVE-2026-100409","body":"## Overview\n\nOpenNext 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-100409)\n\nAffected packages:\n\n- `@opennextjs/cloudflare >= 0.3.0, < 1.20.2`\n\nPatched in:\n\n- `@opennextjs/cloudflare 1.20.2`\n\nSource: https://github.com/advisories/GHSA-2vc4-c4r6-p6v6","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}