CVE-2026-76992

published 2026-09-30

CVE-2026-76992: The CODESYS Gateway Client allocates memory based on a size field in a gateway response without enforcing an appropriate upper limit. An unauthenticated remote…

Priority P3 45 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

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.

Affected

8 ranges

Vendor	Product	Version range	Fixed in
codesys	development_system_3	>= 3.0.0.0 < 3.5.22.40	3.5.22.40
codesys	edge_gateway_for_linux	>= 3.15.0.0 < 4.23.0.0	4.23.0.0
codesys	edge_gateway_for_windows	>= 3.0.0.0 < 3.5.22.40	3.5.22.40
codesys	gateway	>= 3.0.0.0 < 3.5.22.40	3.5.22.40
codesys	hmi	>= 3.0.0.0 < 3.5.22.40	3.5.22.40
codesys	opc_da_server_sl	>= 3.0.0.0 < 3.5.22.40	3.5.22.40
codesys	plchandler	>= 3.0.0.0 < 3.5.22.40	3.5.22.40
codesys	runtime_toolkit	>= 3.0.0.0 < 3.5.22.40	3.5.22.40

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd v4.0 8.7 HIGH 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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CWE-770