{"id":"CVE-2026-93578","state":"PUBLISHED","title":"Io.netty/netty-handler-ssl-ocsp: netty: missing extended key usage (eku) check in ocsp client allows certificate revocation bypass","description":"A flaw was found in Netty's Online Certificate Status Protocol (OCSP) Client. The client fails to verify the 'id-kp-OCSPSigning' Extended Key Usage (EKU) in OCSP responder certificates. A remote attacker, holding any valid certificate issued by the same Certificate Authority (CA), can exploit this by forging 'GOOD' OCSP responses for revoked certificates. This bypasses certificate revocation checks, allowing applications using Netty's OCSP Client to accept certificates that should have been revoked, leading to an authorization bypass.","publishedAt":"2026-09-18T10:53:59.267Z","updatedAt":"2026-09-18T16:54:16.469Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","source":"redhat"},"assigner":"redhat","products":["Red Hat Red Hat build of Apache Camel for Spring Boot 4"],"affected":[{"vendor":"Red Hat","product":"Red Hat build of Apache Camel for Spring Boot 4","packageName":"netty-handler-ssl-ocsp","defaultStatus":"affected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:camel_spring_boot:4"]}],"references":["https://access.redhat.com/security/cve/CVE-2026-93578","https://bugzilla.redhat.com/show_bug.cgi?id=2536969"],"weaknesses":["CWE-1035"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93578.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93578","state":"PUBLISHED","datePublished":"2026-09-18T10:53:59.267Z","dateUpdated":"2026-09-18T16:54:16.469Z","assignerShortName":"redhat","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateReserved":"2026-09-18T10:34:48.070Z"},"containers":{"cna":{"title":"Io.netty/netty-handler-ssl-ocsp: netty: missing extended key usage (eku) check in ocsp client allows certificate revocation bypass","descriptions":[{"lang":"en","value":"A flaw was found in Netty's Online Certificate Status Protocol (OCSP) Client. The client fails to verify the 'id-kp-OCSPSigning' Extended Key Usage (EKU) in OCSP responder certificates. A remote attacker, holding any valid certificate issued by the same Certificate Authority (CA), can exploit this by forging 'GOOD' OCSP responses for revoked certificates. This bypasses certificate revocation checks, allowing applications using Netty's OCSP Client to accept certificates that should have been revoked, leading to an authorization bypass."}],"affected":[{"vendor":"Red Hat","product":"Red Hat build of Apache Camel for Spring Boot 4","packageName":"netty-handler-ssl-ocsp","defaultStatus":"affected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:camel_spring_boot:4"]}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-93578","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2536969","name":"RHBZ#2536969","tags":["issue-tracking","x_refsource_REDHAT"]}],"metrics":[{"other":{"content":{"value":"Moderate","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1035","description":"CWE-1035","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"redhat","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","dateUpdated":"2026-09-18T16:54:16.469Z"},"datePublic":"2026-09-10T00:54:25.000Z","x_redhatCweChain":"CWE-1035","workarounds":[{"lang":"en","value":"See https://github.com/netty/netty/security/advisories/GHSA-jhjp-5q4f-8wr2 for fixed versions and remediation guidance."}],"timeline":[{"lang":"en","time":"2026-09-10T00:54:25.000Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-09-10T00:54:25.000Z","value":"Made public."}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-93578","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-18T14:41:00.538935Z","id":"CVE-2026-93578","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-18T14:44:11.462Z"}}]}}}