CVE-2026-76992 json
Uncontrolled Memory Allocation in CODESYS Gateway Client
published 2026-09-30 39 d ago modified 2026-09-30 39 d ago also EUVD-2026-89776
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 26%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- CODESYS Development System 3 3.5.22.40
- CODESYS Gateway 3.5.22.40
- CODESYS Edge Gateway for Windows 3.5.22.40
- CODESYS HMI (SL) 3.5.22.40
- CODESYS OPC DA Server SL 3.5.22.40
- CODESYS PLCHandler 3.5.22.40
- CODESYS Runtime Toolkit 3.5.22.40
- CODESYS Edge Gateway for Linux 4.23.0.0
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 39 d ago
Exploit prediction
0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | 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 |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CNA | 4.0 | 8.7 | 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 |
Affected products
- CODESYS Development System 3
- CODESYS Gateway
- CODESYS Edge Gateway for Windows
- CODESYS HMI (SL)
- CODESYS OPC DA Server SL
- CODESYS PLCHandler
- CODESYS Runtime Toolkit
- CODESYS Edge Gateway for Linux
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
Sources
- CVE List CVE-2026-76992
- NVD CVE-2026-76992
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