CVE-2026-70667

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{"affected": [{"affectedData": [{"product": "lemur", "vendor": "Netflix", "versions": [{"status": "affected", "version": "< 1.9.3"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Lemur manages TLS certificate creation. Prior to 1.9.3, _validate_revocation_url in lemur/certificates/verify.py checked the original CRL or OCSP URL but the later request could reach a different destination. The CRL requests.get call followed HTTP redirects without validating each Location target, so a public attacker-controlled URL could redirect to loopback, RFC1918, link-local, or instance-metadata addresses. Validation and connection also performed separate DNS resolutions, creating a time-of-check time-of-use window for DNS rebinding on both CRL and OCSP paths. An operator uploading a certificate through POST /api/1/certificates/upload could therefore induce blind internal requests despite the earlier mitigation. The fix disables redirects and pins validated addresses while preserving the correct Host value. This issue is fixed in version 1.9.3."}, {"lang": "es", "value": "Lemur gestiona la creaci\u00f3n de certificados TLS. Antes de la versi\u00f3n 1.9.3, _validate_revocation_url en lemur/certificates/verify.py verificaba la URL original de CRL u OCSP, pero la solicitud posterior podr\u00eda alcanzar un destino diferente. La llamada requests.get de CRL segu\u00eda redirecciones HTTP sin validar cada objetivo de Location, por lo que una URL p\u00fablica controlada por un atacante podr\u00eda redirigir a direcciones de loopback, RFC1918, link-local o de metadatos de instancia. La validaci\u00f3n y la conexi\u00f3n tambi\u00e9n realizaban resoluciones DNS separadas, creando una ventana de tiempo de verificaci\u00f3n y tiempo de uso para el DNS rebinding en ambas rutas CRL y OCSP. Un operador que sub\u00eda un certificado a trav\u00e9s de POST /api/1/certificates/upload podr\u00eda, por lo tanto, inducir solicitudes internas ciegas a pesar de la mitigaci\u00f3n anterior. La soluci\u00f3n deshabilita las redirecciones y fija direcciones validadas mientras preserva el valor correcto de Host. Este problema est\u00e1 solucionado en la versi\u00f3n 1.9.3."}], "id": "CVE-2026-70667", "lastModified": "2026-10-22T22:10:00.250", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-70667", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-19T15:16:23.054190Z", "version": "2.0.3"}}]}, "published": "2026-08-18T19:17:03.293", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/Netflix/lemur/commit/ed504a830f38a83825b1570302e9f38d6553938a"}, {"source": "security-advisories@github.com", "url": "https://github.com/Netflix/lemur/releases/tag/v1.9.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/Netflix/lemur/security/advisories/GHSA-f3qq-49m6-rw8f"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/Netflix/lemur/security/advisories/GHSA-54vg-pfh7-jq95"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-367"}, {"lang": "en", "value": "CWE-918"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.9.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "lemur", "source": "cna", "vendor": "Netflix"}, "product": "lemur", "vendor": "netflix"}], "created": "2026-08-18T20:45:04.333710+00:00", "updated": "2026-08-18T22:00:14.765548+00:00", "vendors": ["netflix", "netflix$PRODUCT$lemur"]}