{"id":"CVE-2026-18257","aliases":["EUVD-2026-50410","GHSA-xph3-r29g-fwfg"],"status":"published","title":"Improper Certificate Validation in S2OPC","description":"Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrapper of S2OPC allows a certificate issued by this root issuer to be considered trusted","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":"2026-11-11","score":0.00155,"percentile":0.04643,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-295"],"published":"2026-07-29T16:34:09Z","modified":"2026-10-24T13:10:00Z","products":[{"vendor":"systerel","product":"s2opc"}],"references":[{"url":"https://gitlab.com/systerel/S2OPC/-/work_items/1804"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18257"},{"url":"https://github.com/advisories/GHSA-xph3-r29g-fwfg"}],"sources":{"cve":[{"id":"CVE-2026-18257","title":"Improper Certificate Validation in S2OPC","description":"Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrapper of S2OPC allows a certificate issued by this root issuer to be considered trusted","status":"published","published":"2026-07-29T16:34:09.688Z","modified":"2026-07-29T18:04:53.132Z","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-295"],"updated_at":"2026-11-02T14:20:12.260247Z"}],"euvd":[{"id":"EUVD-2026-50410","description":"Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrapper of S2OPC allows a certificate issued by this root issuer to be considered trusted","status":"published","published":"2026-07-29T16:34:09Z","modified":"2026-07-29T18:04:53Z","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":"2026-11-02T18:02:29.807737Z"}],"ghsa":[{"id":"GHSA-xph3-r29g-fwfg","title":"Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrapper...","description":"Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrapper of S2OPC allows a certificate issued by this root issuer to be considered trusted","status":"published","published":"2026-07-29T18:31:40Z","modified":"2026-07-29T18:31:46Z","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-295"],"updated_at":"2026-11-02T15:09:54.335538Z"}],"nvd":[{"id":"CVE-2026-18257","description":"Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrapper of S2OPC allows a certificate issued by this root issuer to be considered trusted","status":"published","published":"2026-07-29T17:16:51.54Z","modified":"2026-10-24T13:10:00.147Z","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-295"],"updated_at":"2026-11-02T14:12:33.629616Z"}]}}