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TI-2026-15010 Aliases CVE-2026-18257GHSA-xph3-r29g-fwfg

Improper Certificate Validation in S2OPC

Priority LOW 24CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-295.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00155 4th percentileScored 2026-11-07
Fix Fixed S2OPC (Systerel): 2.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SysterelS2OPC1.5.0 to before 2.0.02.0.0Patch availableCNA
  • S2OPC VendorSysterel Affected 1.5.0 to before 2.0.0 Fixed in 2.0.0 Patch available CNA

Remediation

  • Fix · CNA S2OPC (Systerel) Fixed in 2.0.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-18257
  2. 2026-10-03 Alias added: GHSA-xph3-r29g-fwfg

References

Other 1

  • TI-2026-54290 Systerel S2OPC AddNodes Service sopc_node_mgt_helper_internal.c out-of-bounds CVSS 4.0MEDIUM 6.3
  • TI-2026-61689 S2OPC through 1.7.3 NULL Pointer Dereference in alloc_notification_message_items() CVSS 4.0MEDIUM 6.0
  • TI-2026-56960 Systerel S2OPC subscription_mgr.c use after free CVSS 4.0MEDIUM 5.3
  • TI-2026-56959 Systerel S2OPC String Array Range Writing sopc_builtintypes.c set_range_matrix_on_string_array out-of-bounds CVSS 4.0MEDIUM 5.3
  • TI-2026-15394 Systerel S2OPC DeleteMonitoredItemsRequest state_machine.c out-of-bounds CVSS 4.0MEDIUM 4.8
  • TI-2026-08554 Improper Certificate Validation in S2OPC CVSS 3.1HIGH 7.3
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences