CVE-2026-3125

{"id": "CVE-2026-3125", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "cna@cloudflare.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.7, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "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/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "LOW", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "published": "2026-03-04T19:16:19.730", "references": [{"url": "https://github.com/advisories/GHSA-rvpw-p7vw-wj3m", "tags": ["Third Party Advisory"], "source": "cna@cloudflare.com"}, {"url": "https://github.com/opennextjs/opennextjs-cloudflare/pull/1147", "tags": ["Issue Tracking", "Patch"], "source": "cna@cloudflare.com"}, {"url": "https://www.cve.org/cverecord?id=CVE-2025-6087", "tags": ["Third Party Advisory"], "source": "cna@cloudflare.com"}, {"url": "https://www.npmjs.com/package/@opennextjs/cloudflare/v/1.17.1", "tags": ["Product", "Release Notes"], "source": "cna@cloudflare.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "cna@cloudflare.com", "description": [{"lang": "en", "value": "CWE-706"}, {"lang": "en", "value": "CWE-918"}]}, {"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-918"}]}], "descriptions": [{"lang": "en", "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."}, {"lang": "es", "value": "Una vulnerabilidad de falsificaci\u00f3n de petici\u00f3n del lado del servidor (SSRF) fue identificada en el paquete @opennextjs/cloudflare, resultante de un bypass de normalizaci\u00f3n de ruta en el gestor /cdn-cgi/image/. La plantilla de worker @opennextjs/cloudflare incluye un gestor /cdn-cgi/image/ destinado solo para uso en desarrollo. En producci\u00f3n, el edge de Cloudflare intercepta las peticiones /cdn-cgi/image/ antes de que lleguen al Worker. Sin embargo, al sustituir una barra invertida por una barra inclinada (/cdn-cgi\\image/ en lugar de /cdn-cgi/image/), un atacante puede eludir la intercepci\u00f3n del edge y hacer que la petici\u00f3n llegue directamente al Worker. La clase URL de JavaScript luego normaliza la barra invertida a una barra inclinada, haciendo que la petici\u00f3n coincida con el gestor y desencadene una obtenci\u00f3n no validada de URLs remotas arbitrarias.\n\nPor ejemplo:\n\nhttps://victim-site.com/cdn-cgi\\image/aaaa/https://attacker.com\n\nEn este ejemplo, contenido controlado por el atacante de attacker.com se sirve a trav\u00e9s del dominio del sitio v\u00edctima (victim-site.com), violando la pol\u00edtica de mismo origen y potencialmente enga\u00f1ando a usuarios u otros servicios.\n\nNota: Este bypass solo funciona a trav\u00e9s de clientes HTTP que preservan las barras invertidas en las rutas (p. ej., curl --path-as-is). Los navegadores normalizan las barras invertidas a barras inclinadas antes de enviar las peticiones.\n\nAdem\u00e1s, Cloudflare Workers con Assets y Cloudflare Pages sufren de una vulnerabilidad similar. Los Assets almacenados bajo rutas /cdn-cgi/ no son accesibles p\u00fablicamente bajo condiciones normales. Sin embargo, utilizando el mismo bypass de barra invertida (/cdn-cgi\\... en lugar de /cdn-cgi/...), estos assets se vuelven accesibles p\u00fablicamente. Esto podr\u00eda usarse para recuperar datos privados. Por ejemplo, los proyectos Open Next almacenan datos de cach\u00e9 incremental bajo /cdn-cgi/_next_cache, que podr\u00edan ser expuestos a trav\u00e9s de este bypass."}], "lastModified": "2026-03-09T17:51:18.853", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:opennextjs:opennext_for_cloudflare:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "FFD587A5-A6DA-4D83-9903-7AD395DE5744", "versionEndExcluding": "1.17.1"}], "operator": "OR"}]}], "sourceIdentifier": "cna@cloudflare.com"}