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CVE-2026-76992

HIGHCVSS 7.5/10

Last modified

CVE-2026-76992 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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..

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS 4.0
8.7/10

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

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
CODESYSDevelopment System 3>= 3.0.0.0, < 3.5.22.40
CODESYSGateway>= 3.0.0.0, < 3.5.22.40
CODESYSEdge Gateway for Windows>= 3.0.0.0, < 3.5.22.40
CODESYSHMI (SL)>= 3.0.0.0, < 3.5.22.40
CODESYSOPC DA Server SL>= 3.0.0.0, < 3.5.22.40
CODESYSPLCHandler>= 3.0.0.0, < 3.5.22.40
CODESYSRuntime Toolkit>= 3.0.0.0, < 3.5.22.40
CODESYSEdge Gateway for Linux>= 3.15.0.0, < 4.23.0.0

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is 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 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.
How severe is CVE-2026-76992?
CVE-2026-76992 has a CVSS score of 7.5/10 (HIGH severity).
How do I fix CVE-2026-76992?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST