Remote code execution via zero-length result write
Published Aug 17, 2026 · Updated Aug 18, 2026
Heap-based out-of-bounds write in S2OPC 1.7.3 allows remote attackers to execute arbitrary code through a crafted OPC UA request. EventFilter validation allocates a zero-length OperandStatusCodes array for an empty WhereClause element, then writes a status code to element zero without checking its length. An unauthenticated client with network access to an affected server's OPC UA endpoint can corrupt heap memory, crash the service, or execute code.
Summary
What happened
Heap-based out-of-bounds write in S2OPC 1.7.3 allows remote attackers to execute arbitrary code through a crafted OPC UA request. EventFilter validation allocates a zero-length OperandStatusCodes array for an empty WhereClause element, then writes a status code to element zero without checking its length. An unauthenticated client with network access to an affected server's OPC UA endpoint can corrupt heap memory, crash the service, or execute code.
The record
- CVE
- CVE-2026-67868
- Published
- Aug 17, 2026
- Updated
- Aug 18, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-122, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 17, 2026CVE publishedPublication date reported by the CVE source.
- Aug 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- S2OPC EventFilter WhereClause proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo