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High

Uncontrolled Memory Allocation in CODESYS Gateway Client

Type: advisorySource: Official CVE List1 source 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.

Announced Group revision 1
Original source ↗

CVE-2026-76992

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-76992

Development System 3

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Gateway

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Edge Gateway for Windows

Source reference: /containers/cna/affected/2/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

HMI (SL)

Source reference: /containers/cna/affected/3/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

OPC DA Server SL

Source reference: /containers/cna/affected/4/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

PLCHandler

Source reference: /containers/cna/affected/5/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Runtime Toolkit

Source reference: /containers/cna/affected/6/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Edge Gateway for Linux

Source reference: /containers/cna/affected/7/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "CODESYS",
    "product": "Development System 3",
    "versions": [
      {
        "status": "affected",
        "version": "3.0.0.0",
        "lessThan": "3.5.22.40",
        "versionType": "generic"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "CODESYS",
    "product": "Gateway",
    "versions": [
      {
        "status": "affected",
        "version": "3.0.0.0",
        "lessThan": "3.5.22.40",
        "versionType": "generic"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "CODESYS",
    "product": "Edge Gateway for Windows",
    "versions": [
      {
        "status": "affected",
        "version": "3.0.0.0",
        "lessThan": "3.5.22.40",
        "versionType": "generic"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "CODESYS",
    "product": "HMI (SL)",
    "versions": [
      {
        "status": "affected",
        "version": "3.0.0.0",
        "lessThan": "3.5.22.40",
        "versionType": "generic"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "CODESYS",
    "product": "OPC DA Server SL",
    "versions": [
      {
        "status": "affected",
        "version": "3.0.0.0",
        "lessThan": "3.5.22.40",
        "versionType": "generic"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "CODESYS",
    "product": "PLCHandler",
    "versions": [
      {
        "status": "affected",
        "version": "3.0.0.0",
        "lessThan": "3.5.22.40",
        "versionType": "generic"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "CODESYS",
    "product": "Runtime Toolkit",
    "versions": [
      {
        "status": "affected",
        "version": "3.0.0.0",
        "lessThan": "3.5.22.40",
        "versionType": "generic"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "CODESYS",
    "product": "Edge Gateway for Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.15.0.0",
        "lessThan": "4.23.0.0",
        "versionType": "generic"
      }
    ],
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-76992

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#4525 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-76992 · Revision 1Source updated