vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2026-76992

Uncontrolled Memory Allocation in CODESYS Gateway Client

HIGH
7.5
CVSS Score
Published: September 30, 2026 at 11:07 AM UTC
Updated: September 30, 2026 at 07:57 PM UTC
7 products affected across 1 vendorHMI (SL)Development System V3Runtime Toolkit

Using Development System 3 by CODESYS?

Get instant alerts when new vulnerabilities affect Development System 3 - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH7.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Development System V3· Codesys
60%
3.0.0.0 ≤ v < 3.5.22.403.0.0.0
Affected range stops below 3.5.22.40, so it looks safe — our inference, not a vendor statement
Edge Gateway· Codesys
60%
3.0.0.0 ≤ v < 3.5.22.403.15.0.0 ≤ v < 4.23.0.03.0.0.03.15.0.0
Affected range stops below 3.5.22.40, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.23.0.0, so it looks safe — our inference, not a vendor statement
Gateway· Codesys
60%
3.0.0.0 ≤ v < 3.5.22.403.0.0.0
Affected range stops below 3.5.22.40, so it looks safe — our inference, not a vendor statement
HMI (SL)· Codesys
60%
3.0.0.0 ≤ v < 3.5.22.403.0.0.0
Affected range stops below 3.5.22.40, so it looks safe — our inference, not a vendor statement
Opc Da Server· Codesys
60%
3.0.0.0 ≤ v < 3.5.22.403.0.0.0
Affected range stops below 3.5.22.40, so it looks safe — our inference, not a vendor statement
PLCHandler· Codesys
60%
3.0.0.0 ≤ v < 3.5.22.403.0.0.0
Affected range stops below 3.5.22.40, so it looks safe — our inference, not a vendor statement
Runtime Toolkit· Codesys
60%
3.0.0.0 ≤ v < 3.5.22.403.0.0.0
Affected range stops below 3.5.22.40, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: [email protected]
https://www.certvde.com/en/advisories/VDE-2026-094/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCERTVDE
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-770

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card