vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2026-18257

Improper Certificate Validation in S2OPC

MEDIUM
5.6
CVSS Score
Published: July 29, 2026 at 04:34 PM UTC
Updated: October 24, 2026 at 01:10 PM UTC
1 product affected across 1 vendorS2OPC

Using S2OPC by Systerel?

Get instant alerts when new vulnerabilities affect S2OPC - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM5.6
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

S2OPC· Systerel
90%
1.5.0 ≤ v < 2.0.01.5.0
Affected range stops below 2.0.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.6MEDIUMGitLab
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-295

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card