# OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths Advisory record · `GHSA-2vc4-c4r6-p6v6` - **Identifiers:** `GHSA-2vc4-c4r6-p6v6` · `CVE-2026-100409` - **State:** Confirmed - **Severity:** CVSS 7.5 High - **Critical:** No - **Weakness (CWE):** [CWE-177](https://cwe.mitre.org/data/definitions/177.html) · [CWE-180](https://cwe.mitre.org/data/definitions/180.html) - **Tags:** [CWE-177](https://agentprime.io/advisories/tag/cwe-177.md) · [CWE-180](https://agentprime.io/advisories/tag/cwe-180.md) - **Published:** 15 Oct 2026 - **Updated:** 15 Oct 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 15 Oct 2026, 20:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `@opennextjs/cloudflare` (npm): affected `>=0.3.0, <1.20.2`; fixed in `1.20.2` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > The @opennextjs/cloudflare npm package, versions 0.3.0 up to but not including 1.20.2, can interpret percent-encoded paths differently during middleware matching and cache lookup when cache interception is enabled (it is disabled by default). A remote, unauthenticated attacker can send an encoded request that skips authorization middleware and receive cached content from a protected route. Upgrade to @opennextjs/cloudflare 1.20.2 or later; until then, disable cache interception or enforce authorization inside route handlers. Written 31 Oct 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.0049, the 42nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 13:33 UTC: First seen by agentprime - 31 Oct 2026, 13:33 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-2vc4-c4r6-p6v6) ## Sources - [GitHub Advisory Database: GHSA-2vc4-c4r6-p6v6](https://github.com/advisories/GHSA-2vc4-c4r6-p6v6) - [OSV: GHSA-2vc4-c4r6-p6v6](https://osv.dev/vulnerability/GHSA-2vc4-c4r6-p6v6) - - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .