CVE-2026-76992

Uncontrolled Memory Allocation in CODESYS Gateway Client

Published Sep 30, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

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History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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
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'}