Denial of Service Vulnerability in CODESYS Gateway Client by CODESYS GmbH
CVE-2026-76992

8.7HIGH

Key Information:

Vendor

Codesys

Status
Development System 3
Gateway
Edge Gateway For Windows
Hmi (sl)
Vendor
CVE Published:
30 September 2026

What is CVE-2026-76992?

The CODESYS Gateway Client has a vulnerability that allows an attacker to exploit improper memory allocation based on a size field in the gateway response without an upper limit. This flaw can be potentially exploited by an unauthenticated remote attacker to manipulate gateway responses, leading to excessive memory consumption. As a result, this can cause a denial-of-service condition, severely affecting the availability of services dependent on the CODESYS Gateway Client.

Affected Version(s)

Development System 3 3.0.0.0 < 3.5.22.40

Edge Gateway for Linux 3.15.0.0 < 4.23.0.0

Edge Gateway for Windows 3.0.0.0 < 3.5.22.40

References

https://www.certvde.com/en/advisories/VDE-2026-094/

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Delta Electronics Inc.
.