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.

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Advisories

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Fixes

Solution

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Workaround

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History

Wed, 30 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Codesys development System V3
Codesys edge Gateway For Linux
Codesys gateway
Codesys hmi (sl)
Codesys opc Da Server
Codesys plchandler
Codesys runtime Toolkit
Vendors & Products Codesys development System V3
Codesys edge Gateway For Linux
Codesys gateway
Codesys hmi (sl)
Codesys opc Da Server
Codesys plchandler
Codesys runtime Toolkit

Wed, 30 Sep 2026 11:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Uncontrolled Memory Allocation in CODESYS Gateway Client
First Time appeared Codesys
Codesys codesys Development System 3
Codesys codesys Edge Gateway For Linux
Codesys codesys Edge Gateway For Windows
Codesys codesys Gateway
Codesys codesys Hmi Sl
Codesys codesys Opc Da Server Sl
Codesys codesys Plchandler
Codesys codesys Runtime Toolkit
Weaknesses CWE-770
CPEs cpe:2.3:a:codesys:codesys_development_system_3:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:codesys_edge_gateway_for_linux:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:codesys_edge_gateway_for_windows:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:codesys_gateway:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:codesys_hmi_sl:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:codesys_opc_da_server_sl:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:codesys_plchandler:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:codesys_runtime_toolkit:*:*:*:*:*:*:*:*
Vendors & Products Codesys
Codesys codesys Development System 3
Codesys codesys Edge Gateway For Linux
Codesys codesys Edge Gateway For Windows
Codesys codesys Gateway
Codesys codesys Hmi Sl
Codesys codesys Opc Da Server Sl
Codesys codesys Plchandler
Codesys codesys Runtime Toolkit
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: CERTVDE

Published:

Updated: 2026-09-30T15:28:07.834Z

Reserved: 2026-08-20T06:57:08.465Z

Link: CVE-2026-76992

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-09-30T11:16:47.283

Modified: 2026-09-30T19:57:08.043

Link: CVE-2026-76992

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-30T20:15:05Z

Weaknesses