CVE-2026-18257: medium-severity vulnerability in Systerel S2OPC
Improper Certificate Validation in S2OPC
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.6epss 0.2%
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
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Affected products
Systerel · S2OPCRelated CVEs — Systerel S2OPC
In the same product, most dangerous first.
CVE-2026-78049MEDIUMSysterel S2OPC AddNodes Service sopc_node_mgt_helper_internal.c out-of-boundsEPSS 0.6%CVE-2026-90782MEDIUMS2OPC through 1.7.3 NULL Pointer Dereference in alloc_notification_message_items()EPSS 0.6%CVE-2026-82619MEDIUMSysterel S2OPC subscription_mgr.c use after freeEPSS 0.5%CVE-2026-82618MEDIUMSysterel S2OPC String Array Range Writing sopc_builtintypes.c set_range_matrix_on_string_array out-of-boundsEPSS 0.5%CVE-2026-18790MEDIUMSysterel S2OPC DeleteMonitoredItemsRequest state_machine.c out-of-boundsEPSS 0.2%CVE-2026-9758HIGHImproper Certificate Validation in S2OPCEPSS 0.1%