CVE-2026-76992 Uncontrolled Memory Allocation in CODESYS Gateway Client
An unauthenticated remote attacker can cause denial of service in CODESYS Gateway Client by triggering excessive memory allocation via a malicious gateway response.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76992?
CVE-2026-76992 is a high-severity denial of service vulnerability in CODESYS Development System 3, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2026-76992?
How do I fix CVE-2026-76992?
No fix has been published for CVE-2026-76992 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-76992 being exploited?
There is no known exploitation of CVE-2026-76992 in the wild and no public exploit code.
Sources
Also known as GHSA-cm9r-92x3-hmfj.