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2 vulnerabilities found for @opennextjs/cloudflare by opennextjs

CVE-2026-3125 (GCVE-0-2026-3125)

Vulnerability from nvd – Published: 2026-03-04 18:14 – Updated: 2026-03-04 18:58
VLAI?
Title
SSRF vulnerability in opennextjs-cloudflare via /cdn-cgi/ path normalization bypass
Summary
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.
Severity ?
7.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
  • CWE-706 - Use of Incorrectly-Resolved Name or Reference
Assigner
References
Impacted products
Vendor Product Version
opennextjs @opennextjs/cloudflare Affected: 0 , < 1.17.1 (npm)
Create a notification for this product.
Credits
https://x.com/ez_z3r
Show details on NVD website
To clipboard 

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CVE-2026-3125 (GCVE-0-2026-3125)

Vulnerability from cvelistv5 – Published: 2026-03-04 18:14 – Updated: 2026-03-04 18:58
VLAI?
Title
SSRF vulnerability in opennextjs-cloudflare via /cdn-cgi/ path normalization bypass
Summary
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.
Severity ?
7.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
  • CWE-706 - Use of Incorrectly-Resolved Name or Reference
Assigner
References
Impacted products
Vendor Product Version
opennextjs @opennextjs/cloudflare Affected: 0 , < 1.17.1 (npm)
Create a notification for this product.
Credits
https://x.com/ez_z3r
Show details on NVD website
To clipboard 

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              "description": "CWE-918 Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
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          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-706",
              "description": "CWE-706 Use of Incorrectly-Resolved Name or Reference",
              "lang": "en",
              "type": "CWE"
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          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-04T18:14:31.111Z",
        "orgId": "a22f1246-ba21-4bb4-a601-ad51614c1513",
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      "references": [
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          "tags": [
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          "url": "https://github.com/opennextjs/opennextjs-cloudflare/pull/1147"
        },
        {
          "tags": [
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          "url": "https://www.npmjs.com/package/@opennextjs/cloudflare/v/1.17.1"
        },
        {
          "tags": [
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          "url": "https://github.com/advisories/GHSA-rvpw-p7vw-wj3m"
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        {
          "tags": [
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          ],
          "url": "https://www.cve.org/cverecord?id=CVE-2025-6087"
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      ],
      "solutions": [
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          "lang": "en",
          "supportingMedia": [
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              "type": "text/html",
              "value": "\u003cp\u003e\u003cspan style=\"background-color: transparent;\"\u003eServer-side updates to Cloudflare\u0027s Workers platform to block backslash path normalization bypasses for /cdn-cgi requests. The update automatically mitigates the issue for all existing and any future sites deployed to Cloudflare Workers.\u003c/span\u003e\u003c/p\u003e\u003cbr\u003e\u003cbr\u003e"
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          "value": "Server-side updates to Cloudflare\u0027s Workers platform to block backslash path normalization bypasses for /cdn-cgi requests. The update automatically mitigates the issue for all existing and any future sites deployed to Cloudflare Workers."
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          "supportingMedia": [
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              "value": "\u003cp\u003e\u003cspan style=\"background-color: transparent;\"\u003eIn addition to the platform level fix, \u003c/span\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/opennextjs/opennextjs-cloudflare/pull/1147\"\u003e\u003cspan style=\"background-color: transparent;\"\u003eroot cause fix\u003c/span\u003e\u003c/a\u003e\u003cspan style=\"background-color: transparent;\"\u003e has been implemented to the Cloudflare adapter for Open Next. The patched version of the adapter is found at @opennextjs/cloudflare@1.17.1 (\u003c/span\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://www.npmjs.com/package/@opennextjs/cloudflare\"\u003e\u003cspan style=\"background-color: transparent;\"\u003ehttps://www.npmjs.com/package/@opennextjs/cloudflare\u003c/span\u003e\u003c/a\u003e\u003cspan style=\"background-color: transparent;\"\u003e)\u003c/span\u003e\u003c/p\u003e\u003cbr\u003e\u003cbr\u003e"
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              "value": "\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/opennextjs/opennextjs-cloudflare/pull/1150\"\u003e\u003cspan style=\"background-color: transparent;\"\u003eDependency update\u003c/span\u003e\u003c/a\u003e\u003cspan style=\"background-color: transparent;\"\u003e to the Next.js template used with create-cloudflare (c3) to use the fixed version of the Cloudflare adapter for Open Next.\u003c/span\u003e\u003cbr\u003e"
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          "value": "Dependency update https://github.com/opennextjs/opennextjs-cloudflare/pull/1150  to the Next.js template used with create-cloudflare (c3) to use the fixed version of the Cloudflare adapter for Open Next."
        }
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      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "SSRF vulnerability in opennextjs-cloudflare via /cdn-cgi/ path normalization bypass",
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  "cveMetadata": {
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    "assignerShortName": "cloudflare",
    "cveId": "CVE-2026-3125",
    "datePublished": "2026-03-04T18:14:31.111Z",
    "dateReserved": "2026-02-24T14:15:54.385Z",
    "dateUpdated": "2026-03-04T18:58:56.614Z",
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