CVE-2026-18257 — MEDIUM (5.6)

Vulnerability 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

CVSS Score

5.6

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

LOW

Related Weaknesses (CWE)

CWE-295

References

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

FAQ

What is CVE-2026-18257?

CVE-2026-18257 is a vulnerability with a CVSS score of 5.6 (MEDIUM). 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

How severe is CVE-2026-18257?

CVE-2026-18257 has been rated MEDIUM with a CVSS base score of 5.6/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-18257?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.