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[ CVE-2026-100409 · Published 15 Oct 2026 ]

OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths

CVSS 7.5 EPSS <1%Fix available

[ Description ]Official 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.

[ Fixes ]Fixes and patches

  • @opennextjs/cloudflare 1.20.2Fixed version · GitHub Advisories · npm package @opennextjs/cloudflare: upgrade to 1.20.2 or later (affected >= 0.3.0, < 1.20.2)

[ Packages ]Affected open-source packages

  • @opennextjs/cloudflare npmAffected >= 0.3.0, < 1.20.2 · fixed in 1.20.2 · GHSA-2vc4-c4r6-p6v6

[ References ]References