{"id":"CVE-2026-18257","state":"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","publishedAt":"2026-07-29T16:34:09.688Z","updatedAt":"2026-07-29T18:04:53.132Z","severity":{"score":5.6,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","source":"GitLab"},"assigner":"GitLab","products":["Systerel S2OPC"],"affected":[{"vendor":"Systerel","product":"S2OPC","defaultStatus":"unaffected","versions":[{"version":"1.5.0","status":"affected","lessThan":"2.0.0","versionType":"semver"}]}],"references":["https://gitlab.com/systerel/S2OPC/-/work_items/1804"],"weaknesses":["CWE-295"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/18xxx/CVE-2026-18257.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-18257","state":"PUBLISHED","datePublished":"2026-07-29T16:34:09.688Z","dateUpdated":"2026-07-29T18:04:53.132Z","assignerShortName":"GitLab","assignerOrgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","dateReserved":"2026-07-29T16:33:59.899Z"},"containers":{"cna":{"title":"Improper Certificate Validation in S2OPC","descriptions":[{"lang":"en","value":"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"}],"affected":[{"vendor":"Systerel","product":"S2OPC","defaultStatus":"unaffected","versions":[{"version":"1.5.0","status":"affected","lessThan":"2.0.0","versionType":"semver"}]}],"references":[{"url":"https://gitlab.com/systerel/S2OPC/-/work_items/1804"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW","baseScore":5.6,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-295","lang":"en","description":"CWE-295: Improper Certificate Validation","type":"CWE"}]}],"providerMetadata":{"shortName":"GitLab","orgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","dateUpdated":"2026-07-29T16:34:09.688Z"},"solutions":[{"lang":"en","value":"Use mbedtls cryptographic wrapper of S2OPC. Or upgrade S2OPC to use CycloneCrypto wrapper of release version >= 2.0.0 or master commit >= 839ae878"}],"credits":[{"lang":"en","value":"Systerel","type":"finder"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-29T18:04:43.478121Z","id":"CVE-2026-18257","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-29T18:04:53.132Z"}}]}}}