CVE-2026-55187

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{"affected": [{"affectedData": [{"product": "mailpit", "vendor": "axllent", "versions": [{"status": "affected", "version": "< 1.30.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Mailpit is an email testing tool and API for developers. Prior to 1.30.2, the remediation shipped for CVE-2026-27808 is incomplete because the tools.IsInternalIP deny-list in internal/tools/net.go relies on Go's standard library classification helpers and does not block IPv6 transition mechanisms or prefixes such as NAT64, 6to4, IPv4-compatible IPv6, ISATAP, fec0::/10, and 2001:db8::/32. An attacker who can deliver email and invoke POST /api/v1/message/{ID}/link-check can coerce the Link Check API's safeDialContext path into dialing internal destinations and can use status-code and error feedback to map internal service reachability, including cloud metadata endpoints. This issue is fixed in version 1.30.2."}, {"lang": "es", "value": "Mailpit es una herramienta de prueba de correo electr\u00f3nico y API para desarrolladores. Antes de la versi\u00f3n 1.30.2, la remediaci\u00f3n enviada para CVE-2026-27808 es incompleta porque la lista de denegaci\u00f3n tools.IsInternalIP en internal/tools/net.go se basa en los ayudantes de clasificaci\u00f3n de la biblioteca est\u00e1ndar de Go y no bloquea los mecanismos de transici\u00f3n o prefijos IPv6 como NAT64, 6to4, IPv6 compatible con IPv4, ISATAP, fec0::/10 y 2001:db8::/32. Un atacante que puede entregar correo electr\u00f3nico e invocar POST /api/v1/message/{ID}/link-check puede forzar la ruta safeDialContext de la API de verificaci\u00f3n de enlaces a marcar destinos internos y puede usar la retroalimentaci\u00f3n de c\u00f3digos de estado y errores para mapear la accesibilidad del servicio interno, incluyendo los puntos finales de metadatos en la nube. Este problema est\u00e1 solucionado en la versi\u00f3n 1.30.2."}], "id": "CVE-2026-55187", "lastModified": "2026-10-25T15:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55187", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-13T15:55:02.724130Z", "version": "2.0.3"}}]}, "published": "2026-07-10T22:16:43.110", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/axllent/mailpit/commit/a88dadbbe1df016a35a445089ef2a362a6c2de78"}, {"source": "security-advisories@github.com", "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.30.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "mailpit", "source": "cna", "vendor": "axllent"}, "product": "mailpit", "vendor": "axllent"}], "created": "2026-07-10T23:45:04.576461+00:00", "updated": "2026-08-01T12:00:05.611443+00:00", "vendors": ["axllent", "axllent$PRODUCT$mailpit"]}