CVE-2026-40280

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Because Go's net/url.Parse() normalizes the scheme to lowercase before establishing the outbound TCP connection, an attacker can bypass the deny-list by simply capitalizing part of the URL scheme (e.g., HTTP://, HTTPS://, or Http://). This allows unauthenticated requests to reach internal network services, including private IP ranges, loopback addresses, and cloud instance metadata endpoints such as HTTP://169.254.169.254/latest/meta-data/. \n\nThis bypasses the same security control that was patched in CVE-2026-27018.\n\nThis issue has been fixed in version 8.31.0."}, {"lang": "es", "value": "Gotenberg es una herramienta de conversi\u00f3n de documentos basada en API. En las versiones 8.30.1 y anteriores, las listas de denegaci\u00f3n de IP privadas predeterminadas para las banderas --webhook-deny-list y --api-download-from-deny-list utilizan una expresi\u00f3n regular sensible a may\u00fasculas y min\u00fasculas (^https?://) para coincidir con los esquemas de URL. Debido a que net/url.Parse() de Go normaliza el esquema a min\u00fasculas antes de establecer la conexi\u00f3n TCP saliente, un atacante puede eludir la lista de denegaci\u00f3n simplemente capitalizando parte del esquema de URL (p. ej., HTTP://, HTTPS:// o Http://). Esto permite que las solicitudes no autenticadas alcancen servicios de red internos, incluyendo rangos de IP privadas, direcciones de bucle invertido y puntos finales de metadatos de instancias en la nube como HTTP://169.254.169.254/latest/meta-data/.\n\nEsto elude el mismo control de seguridad que fue parcheado en CVE-2026-27018.\n\nEste problema ha sido solucionado en la versi\u00f3n 8.31.0."}], "id": "CVE-2026-40280", "lastModified": "2026-07-24T21:10:00.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40280", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-06T18:41:39.882866Z", "version": "2.0.3"}}]}, "published": "2026-05-05T20:16:38.633", "references": [{"source": "security-advisories@github.com", "tags": ["Not Applicable"], "url": "https://github.com/advisories/GHSA-jjwv-57xh-xr6r"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/gotenberg/gotenberg/commit/3f01ca18d3cc21375a1e2da4b5a3f261c8548e47"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-5q7p-7jgv-ww56"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-5q7p-7jgv-ww56"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.30.1]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "gotenberg", "source": "cna", "vendor": "gotenberg"}, "product": "gotenberg", "vendor": "gotenberg"}], "created": "2026-05-05T21:30:05.737718+00:00", "updated": "2026-08-15T21:30:04.289829+00:00", "vendors": ["gotenberg", "gotenberg$PRODUCT$gotenberg"]}