{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-18257","assignerOrgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","state":"PUBLISHED","assignerShortName":"GitLab","dateReserved":"2026-07-29T16:33:59.899Z","datePublished":"2026-07-29T16:34:09.688Z","dateUpdated":"2026-07-29T18:04:53.132Z"},"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","versions":[{"version":"1.5.0","status":"affected","lessThan":"2.0.0","versionType":"semver"}],"defaultStatus":"unaffected"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-295: Improper Certificate Validation","cweId":"CWE-295","type":"CWE"}]}],"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"}}],"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"}],"providerMetadata":{"orgId":"ceab7361-8a18-47b1-92ba-4d7d25f6715a","shortName":"GitLab","dateUpdated":"2026-07-29T16:34:09.688Z"}},"adp":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-29T18:04:53.132Z"}}]}}