CVE-2026-18257

MEDIUM

Improper Certificate Validation in S2OPC

Title source: cna

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

References (1)

Core 1

Core References

https://gitlab.com/systerel/S2OPC/-/work_items/1804

Scores

CVSS v3 5.6

EPSS 0.0010

EPSS Percentile 1.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-295

Status published

Products (1)

Systerel/S2OPC 1.5.0 - 2.0.0

Published Jul 29, 2026

Tracked Since Jul 29, 2026