CVE-2026-76992

highpriority · track · 30EPSS 0.003 · 26 %ileDE

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.33% (26th) EPSS

CVSS 7.5 · high

Is it mine?

24 products

Check your exposure

Who says so?

2 sources

cert_bund · codesys_psirt

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedcodesys_psirt
Update the following products to version 3.5.22.40. * CODESYS Development System 3 * CODESYS Gateway * CODESYS Edge Gateway for Windows * CODESYS HMI (SL) * CODESYS OPC DA Server SL * CODESYS PLCHandler * CODESYS Runtime Toolkit The CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/.
No fix availableCODESYS Edge Gateway for Linuxcodesys_psirt
Update the following product to version 4.23.0.0. The release of this version is expected in Q4 2026. * CODESYS Edge Gateway for Linux The CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/.

cvss

Technical severity, 0–10. One row per scoring source.

8.7

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–8.7

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · info@cert.vde.comexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CODESYS PSIRT

v4.08.7highCVSS: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:Xsecondary · info@cert.vde.com

v4.06.6mediumCVSS: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:U/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:Xsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USCWE-770US

affected products (24)

Products and version ranges known to be affected.

CODESYS CODESYS≤ Development System 3 <3.5.22.40cert_bundDE
CODESYS CODESYS≤ Edge Gateway for Linux <4.23.0.0cert_bundDE
CODESYS CODESYS≤ Edge Gateway for Windows <3.5.22.40cert_bundDE
CODESYS CODESYS≤ Gateway <3.5.22.40cert_bundDE
CODESYS CODESYS≤ HMI (SL) <3.5.22.40cert_bundDE
CODESYS CODESYS≤ OPC DA Server SL <3.5.22.40cert_bundDE
CODESYS CODESYS≤ PLCHandler <3.5.22.40cert_bundDE
CODESYS CODESYS≤ Runtime Toolkit <3.5.22.40cert_bundDE
CODESYS Development System 3≤ vers:generic/>=3.0.0.0|<3.5.22.40codesys_psirtDEcpe:2.3:a:codesys:codesys_development_system_3:*:*:*:*:*:*:*:*
CODESYS Development System 3all versionsfixedcodesys_psirtDEcpe:2.3:a:codesys:codesys_development_system_3:3.5.22.40:*:*:*:*:*:*:*
CODESYS Edge Gateway for Linux≤ vers:generic/>=3.15.0.0|<4.23.0.0codesys_psirtDEcpe:2.3:a:codesys:codesys_edge_gateway_for_linux:*:*:*:*:*:*:*:*
CODESYS Edge Gateway for Linuxall versionsfixedcodesys_psirtDEcpe:2.3:a:codesys:codesys_edge_gateway_for_linux:4.23.0.0:*:*:*:*:*:*:*
CODESYS Edge Gateway for Windows≤ vers:generic/>=3.0.0.0|<3.5.22.40codesys_psirtDEcpe:2.3:a:codesys:codesys_edge_gateway_for_windows:*:*:*:*:*:*:*:*
CODESYS Edge Gateway for Windowsall versionsfixedcodesys_psirtDEcpe:2.3:a:codesys:codesys_edge_gateway_for_windows:3.5.22.40:*:*:*:*:*:*:*
CODESYS Gateway ≤ vers:generic/>=3.0.0.0|<3.5.22.40codesys_psirtDEcpe:2.3:a:codesys:codesys_gateway:*:*:*:*:*:*:*:*
CODESYS Gateway all versionsfixedcodesys_psirtDEcpe:2.3:a:codesys:codesys_gateway:3.5.22.40:*:*:*:*:*:*:*
CODESYS HMI (SL)≤ vers:generic/>=3.0.0.0|<3.5.22.40codesys_psirtDEcpe:2.3:a:codesys:codesys_hmi_sl:*:*:*:*:*:*:*:*
CODESYS HMI (SL)all versionsfixedcodesys_psirtDEcpe:2.3:a:codesys:codesys_hmi_sl:3.5.22.40:*:*:*:*:*:*:*
CODESYS OPC DA Server SL≤ vers:generic/>=3.0.0.0|<3.5.22.40codesys_psirtDEcpe:2.3:a:codesys:codesys_opc_da_server_sl:*:*:*:*:*:*:*:*
CODESYS OPC DA Server SLall versionsfixedcodesys_psirtDEcpe:2.3:a:codesys:codesys_opc_da_server_sl:3.5.22.40:*:*:*:*:*:*:*

showing 20 of 24

advisories (3)

Vendor and ecosystem advisories describing this.

Advisory2026-11_VDE-2026-094CODESYS Gateway Client - Uncontrolled Memory Allocation2026-09-30csaf · codesys_psirtDE
The CODESYS Gateway Client (CmpGatewayClient) is used by various CODESYS products to establish PLC communication via the CODESYS Gateway. Due to missing limits on memory allocations derived from a size field in a gateway response, a malicious gateway can cause excessive memory consumption in the client, resulting in a denial-of-service condition. The vulnerability can be exploited when an affected product connects to an attacker-controlled gateway.
WID-SEC-W-2026-3688CODESYS Gateway Client: Schwachstelle ermöglicht Denial of ServiceDeutsch2026-09-30csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in CODESYS Gateway Client ausnutzen, um einen Denial of Service Angriff durchzuführen.
WID-SEC-W-2026-3710CODESYS Control Runtime und Gateway Client: Mehrere SchwachstellenDeutsch2026-10-01csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in CODESYS Control Runtime und Gateway Client ausnutzen, um Daten zu manipulieren und einen Denial-of-Service-Zustand herbeizuführen.

sources

Which sources assert this record, and when.

cert_bund codesys_psirt NVD CVE.org MITRE

published 2026-09-30modified 2026-09-30

references (1) nvd

External citations — patches, advisories, analysis.

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

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