CVE-2026-76992
Uncontrolled Memory Allocation in CODESYS Gateway Client
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
The CODESYS Gateway Client allocates memory based on a size field in a gateway response without enforcing an appropriate upper limit. An unauthenticated remote attacker controlling a malicious gateway can exploit this behavior to trigger excessive memory consumption, resulting in a denial-of-service condition thus leading to a total loss of availablity.
| CWE | CWE-770 |
| Vendor | codesys |
| Product | development system 3 |
| Published | Sep 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
CODESYS / Development System 3
3.0.0.0 < 3.5.22.40
CODESYS / Gateway
3.0.0.0 < 3.5.22.40
CODESYS / Edge Gateway for Windows
3.0.0.0 < 3.5.22.40
CODESYS / HMI (SL)
3.0.0.0 < 3.5.22.40
CODESYS / OPC DA Server SL
3.0.0.0 < 3.5.22.40
CODESYS / PLCHandler
3.0.0.0 < 3.5.22.40
CODESYS / Runtime Toolkit
3.0.0.0 < 3.5.22.40
CODESYS / Edge Gateway for Linux
3.15.0.0 < 4.23.0.0
References
Credits
Delta Electronics Inc.