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Advisory record · GHSA-2vc4-c4r6-p6v6

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

CVSS 7.5 HighEPSS 0.0049 · 42nd percentile

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.

PackageEcosystemAffectedFixed in
@opennextjs/cloudflarenpm>=0.3.0, <1.20.21.20.2
Identifiers
GHSA-2vc4-c4r6-p6v6 · CVE-2026-100409
Weakness (CWE)
CWE-177 · CWE-180
Tags
Published
15 Oct 2026
Updated
15 Oct 2026

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

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

  1. 31 Oct 2026, 13:33 UTC First seen by agentprime
  2. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

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.