{"cve":"CVE-2026-100409","nvd":{"published":"2026-10-15T17:17:07.923","modified":"2026-10-16T20:04:29.760","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":["CWE-177","CWE-180"],"references":["https://github.com/opennextjs/opennextjs-aws/pull/1199","https://github.com/opennextjs/opennextjs-aws/pull/1200","https://github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a7df7e70c69d0b57404b","https://github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/cloudflare@1.20.2","https://github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc4-c4r6-p6v6"],"products":[],"source":"nvd","synced_at":"2026-10-19T23:00:53.604569364+00:00"},"epss":{"cve":"CVE-2026-100409","score":0.00305,"percentile":0.23082,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-2vc4-c4r6-p6v6","url":"https://osv.dev/vulnerability/GHSA-2vc4-c4r6-p6v6","summary":"OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths","modified":"2026-10-15T20:30:05.349670038Z","packages":[{"ecosystem":"npm","name":"@opennextjs/cloudflare","purl":"pkg:npm/%40opennextjs/cloudflare","ranges":[">=0.3.0 <1.20.2"],"fixed":["1.20.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}