{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-3125",
        "assignerOrgId": "a22f1246-ba21-4bb4-a601-ad51614c1513",
        "state": "PUBLISHED",
        "assignerShortName": "cloudflare",
        "dateReserved": "2026-02-24T14:15:54.385Z",
        "datePublished": "2026-03-04T18:14:31.111Z",
        "dateUpdated": "2026-03-04T18:58:56.614Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://www.npmjs.com/package/@opennextjs/cloudflare",
                    "defaultStatus": "unaffected",
                    "modules": [
                        "packages/cloudflare/src/cli/templates/worker.ts"
                    ],
                    "packageName": "@opennextjs/cloudflare",
                    "platforms": [
                        "Cloudflare Workers"
                    ],
                    "product": "@opennextjs/cloudflare",
                    "repo": "https://github.com/opennextjs/opennextjs-cloudflare",
                    "vendor": "opennextjs",
                    "versions": [
                        {
                            "lessThan": "1.17.1",
                            "status": "affected",
                            "version": "0",
                            "versionType": "npm"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "https://x.com/ez_z3r"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p><span style=\"background-color: transparent;\">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.</span><span style=\"background-color: transparent;\">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.</span></p><p><span style=\"background-color: transparent;\">For example: </span></p><p><span style=\"background-color: transparent;\"><a target=\"_blank\" rel=\"nofollow\" href=\"https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com\">https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com</a></span></p><p><span style=\"background-color: transparent;\">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.</span></p><p><span style=\"background-color: transparent;\">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.</span></p><span style=\"background-color: transparent;\">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</span><span style=\"background-color: transparent;\">\\.</span><span style=\"background-color: transparent;\">.. 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.</span><br>"
                        }
                    ],
                    "value": "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.\n\nFor example: \n\n https://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com \n\nIn 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.\n\nNote: 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.\n\nAdditionally, 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."
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-664",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-664 Server Side Request Forgery"
                        }
                    ]
                },
                {
                    "capecId": "CAPEC-267",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-267 Leverage Alternate Encoding"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "attackVector": "NETWORK",
                        "baseScore": 7.7,
                        "baseSeverity": "HIGH",
                        "exploitMaturity": "NOT_DEFINED",
                        "privilegesRequired": "NONE",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "HIGH",
                        "subIntegrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "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",
                        "version": "4.0",
                        "vulnAvailabilityImpact": "NONE",
                        "vulnConfidentialityImpact": "LOW",
                        "vulnIntegrityImpact": "LOW",
                        "vulnerabilityResponseEffort": "NOT_DEFINED"
                    },
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-918",
                            "description": "CWE-918 Server-Side Request Forgery (SSRF)",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-706",
                            "description": "CWE-706 Use of Incorrectly-Resolved Name or Reference",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a22f1246-ba21-4bb4-a601-ad51614c1513",
                "shortName": "cloudflare",
                "dateUpdated": "2026-03-04T18:14:31.111Z"
            },
            "references": [
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/opennextjs/opennextjs-cloudflare/pull/1147"
                },
                {
                    "tags": [
                        "product"
                    ],
                    "url": "https://www.npmjs.com/package/@opennextjs/cloudflare/v/1.17.1"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://github.com/advisories/GHSA-rvpw-p7vw-wj3m"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://www.cve.org/cverecord?id=CVE-2025-6087"
                }
            ],
            "solutions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p><span style=\"background-color: transparent;\">Server-side updates to Cloudflare's 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.</span></p><br><br>"
                        }
                    ],
                    "value": "Server-side updates to Cloudflare's 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."
                },
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p><span style=\"background-color: transparent;\">In addition to the platform level fix, </span><a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/opennextjs/opennextjs-cloudflare/pull/1147\"><span style=\"background-color: transparent;\">root cause fix</span></a><span style=\"background-color: transparent;\"> has been implemented to the Cloudflare adapter for Open Next. The patched version of the adapter is found at @opennextjs/cloudflare@1.17.1 (</span><a target=\"_blank\" rel=\"nofollow\" href=\"https://www.npmjs.com/package/@opennextjs/cloudflare\"><span style=\"background-color: transparent;\">https://www.npmjs.com/package/@opennextjs/cloudflare</span></a><span style=\"background-color: transparent;\">)</span></p><br><br>"
                        }
                    ],
                    "value": "In addition to the platform level fix,  root cause fix https://github.com/opennextjs/opennextjs-cloudflare/pull/1147  has been implemented to the Cloudflare adapter for Open Next. The patched version of the adapter is found at @opennextjs/cloudflare@1.17.1 ( https://www.npmjs.com/package/@opennextjs/cloudflare https://www.npmjs.com/package/@opennextjs/cloudflare )"
                },
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/opennextjs/opennextjs-cloudflare/pull/1150\"><span style=\"background-color: transparent;\">Dependency update</span></a><span style=\"background-color: transparent;\"> to the Next.js template used with create-cloudflare (c3) to use the fixed version of the Cloudflare adapter for Open Next.</span><br>"
                        }
                    ],
                    "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."
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "SSRF vulnerability in opennextjs-cloudflare via /cdn-cgi/ path normalization bypass",
            "x_generator": {
                "engine": "Vulnogram 0.5.0"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-03-04T18:58:41.207814Z",
                                "id": "CVE-2026-3125",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-03-04T18:58:56.614Z"
                }
            }
        ]
    }
}