CVE-2026-76992 (GCVE-0-2026-76992)
Vulnerability from cvelistv5 – Published: 2026-09-30 11:07 – Updated: 2026-09-30 15:28
VLAI
EPSS
VEX
Title
Uncontrolled Memory Allocation in CODESYS Gateway Client
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 14:48 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
1 reference
Impacted products
8 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| CODESYS | Development System 3 |
Affected:
3.0.0.0 , < 3.5.22.40
(generic)
|
guessed | |
| CODESYS | Gateway |
Affected:
3.0.0.0 , < 3.5.22.40
(generic)
|
guessed | |
| CODESYS | Edge Gateway for Windows |
Affected:
3.0.0.0 , < 3.5.22.40
(generic)
|
guessed | |
| CODESYS | HMI (SL) |
Affected:
3.0.0.0 , < 3.5.22.40
(generic)
|
guessed | |
| CODESYS | OPC DA Server SL |
Affected:
3.0.0.0 , < 3.5.22.40
(generic)
|
guessed | |
| CODESYS | PLCHandler |
Affected:
3.0.0.0 , < 3.5.22.40
(generic)
|
guessed | |
| CODESYS | Runtime Toolkit |
Affected:
3.0.0.0 , < 3.5.22.40
(generic)
|
guessed | |
| CODESYS | Edge Gateway for Linux |
Affected:
3.15.0.0 , < 4.23.0.0
(generic)
|
guessed |
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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