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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-100409
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-15 17:17:07 UTC
Updated2026-10-16 20:04:29 UTC
DescriptionOpenNext 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.003050000 probability, percentile 0.217740000 (date 2026-10-16)

Problem Types: CWE-177 | CWE-180 | CWE-177 CWE-177: Improper Handling of URL Encoding (Hex Encoding) | CWE-180 CWE-180: Incorrect Behavior Order: Validate Before Canonicalize

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Opennextjs Opennextjs-cloudflare affected >= 0.3.0, < 1.20.2 Not specified

References

ReferenceSourceLinkTags
github.com/opennextjs/opennextjs-cloudflare/commit/38ea40b669be272ddf09a... [email protected] github.com
github.com/opennextjs/opennextjs-cloudflare/security/advisories/GHSA-2vc... [email protected] github.com
github.com/opennextjs/opennextjs-cloudflare/releases/tag/@opennextjs/clo... [email protected] github.com
github.com/opennextjs/opennextjs-aws/pull/1199 [email protected] github.com
github.com/opennextjs/opennextjs-aws/pull/1200 [email protected] github.com
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