{"id":"CVE-2026-6899","aliases":["EUVD-2026-35380","GHSA-j893-vcpr-rgfc"],"status":"published","title":"Improper Check for Certificate Revocation in S2OPC","description":"Check for certificate revocation only considers the first matching CRL and ignores other valid CRLs of the same CA in the CycloneCrypto cryptographic wrapper of S2OPC library. It might allow connection between an OPC UA client and server using a revoked certificate.","severity":{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00108,"percentile":0.01187,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-299"],"published":"2026-06-09T08:39:00Z","modified":"2026-07-23T08:10:00Z","products":[{"vendor":"systerel","product":"s2opc"}],"references":[{"url":"https://gitlab.com/systerel/S2OPC/-/work_items/1739"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6899"},{"url":"https://github.com/advisories/GHSA-j893-vcpr-rgfc"}],"sources":{"cve":[{"id":"CVE-2026-6899","title":"Improper Check for Certificate Revocation in S2OPC","description":"Check for certificate revocation only considers the first matching CRL and ignores other valid CRLs of the same CA in the CycloneCrypto cryptographic wrapper of S2OPC library. It might allow connection between an OPC UA client and server using a revoked certificate.","status":"published","published":"2026-06-09T08:39:00.495Z","modified":"2026-06-09T14:25:59.888Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-299"],"updated_at":"2026-11-02T13:50:04.986624Z"}],"euvd":[{"id":"EUVD-2026-35380","description":"Check for certificate revocation only considers the first matching CRL and ignores other valid CRLs of the same CA in the CycloneCrypto cryptographic wrapper of S2OPC library. It might allow connection between an OPC UA client and server using a revoked certificate.","status":"published","published":"2026-06-09T08:39:00Z","modified":"2026-06-09T14:25:59Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T18:20:48.012898Z"}],"ghsa":[{"id":"GHSA-j893-vcpr-rgfc","title":"Check for certificate revocation only considers the first matching CRL and ignores other valid...","description":"Check for certificate revocation only considers the first matching CRL and ignores other valid CRLs of the same CA in the CycloneCrypto cryptographic wrapper of S2OPC library. It might allow connection between an OPC UA client and server using a revoked certificate.","status":"published","published":"2026-06-09T09:32:07Z","modified":"2026-06-09T09:32:13Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"cwes":["CWE-299"],"updated_at":"2026-11-02T15:08:40.238392Z"}],"nvd":[{"id":"CVE-2026-6899","description":"Check for certificate revocation only considers the first matching CRL and ignores other valid CRLs of the same CA in the CycloneCrypto cryptographic wrapper of S2OPC library. It might allow connection between an OPC UA client and server using a revoked certificate.","status":"published","published":"2026-06-09T09:16:30.737Z","modified":"2026-07-23T08:10:00.137Z","cvss":[{"version":"3.1","score":5.6,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-299"],"updated_at":"2026-11-02T14:12:23.109705Z"}]}}