CVE-2026-76992
Uncontrolled Memory Allocation in CODESYS Gateway Client
No known exploitation. EPSS puts it in the 24th percentile. Fixed in 3.5.22.40.
What to do
Find your product and version, then upgrade to the build on the right.
- CODESYS Development System 3Affected: ≥ 3.0.0.0, < 3.5.22.40Upgrade to: 3.5.22.40Stated by: CVE record
- CODESYS GatewayAffected: ≥ 3.0.0.0, < 3.5.22.40Upgrade to: 3.5.22.40Stated by: CVE record
- CODESYS Edge Gateway for WindowsAffected: ≥ 3.0.0.0, < 3.5.22.40Upgrade to: 3.5.22.40Stated by: CVE record
- CODESYS HMIAffected: ≥ 3.0.0.0, < 3.5.22.40Upgrade to: 3.5.22.40Stated by: CVE record
- CODESYS OPC DA Server SLAffected: ≥ 3.0.0.0, < 3.5.22.40Upgrade to: 3.5.22.40Stated by: CVE record
Versions as the sources state them. 3 more products have version data. Full version matrix after sign-in
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.3% chance of exploitation activity in the next 30 days, which ranks it in the 24th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
5 events over 0 days, from the signal feeds we watch.
- Publishedweakness classified, att&ck mapped, record updated, record updated
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Scored 7.5 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality NoneNo confidentiality impact
- Integrity NoneNo integrity impact
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
References in the record
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