CVE-2026-45265 (GCVE-0-2026-45265)

Vulnerability from cvelistv5 – Published: 2026-11-12 19:59 – Updated: 2026-11-12 19:59
VLAI
Title
Atomic-Read-File RecordCount Stack-Based Out-of-Bounds Write in bacnet-stack
Summary
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.4 and 1.5.1, there is a stack-based out-of-bounds write / stack-buffer-overflow in bacnet-stack when the server processes a malicious Atomic-Read-File request in record access mode. The bug is triggered on the real server side. A crafted request can set an excessively large RecordCount, which is later used as the loop bound for writing record data into a stack-allocated BACNET_ATOMIC_READ_FILE_DATA data structure. However, the stack object only has space for one fileData element. When the loop reaches i = 1, the code computes &data->fileData[1], which is already out of bounds, and the resulting invalid pointer is passed down to memmove(), causing a stack-buffer-overflow. This issue has been patched in versions 1.4.4 and 1.5.1.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CWE
  • CWE-121 - Stack-based Buffer Overflow
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
bacnet-stack bacnet-stack Affected: < 1.4.4
Affected: < 1.5.1
guessed Create a notification for this product.
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{
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        }
      ],
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            "confidentialityImpact": "NONE",
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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
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      "source": {
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        "discovery": "UNKNOWN"
      },
      "title": "Atomic-Read-File RecordCount Stack-Based Out-of-Bounds Write in bacnet-stack"
    }
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  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "cveId": "CVE-2026-45265",
    "datePublished": "2026-11-12T19:59:55.457Z",
    "dateReserved": "2026-05-11T18:41:13.156Z",
    "dateUpdated": "2026-11-12T19:59:55.457Z",
    "state": "PUBLISHED"
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            "value": "BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.4 and 1.5.1, there is a stack-based out-of-bounds write / stack-buffer-overflow in bacnet-stack when the server processes a malicious Atomic-Read-File request in record access mode. The bug is triggered on the real server side. A crafted request can set an excessively large RecordCount, which is later used as the loop bound for writing record data into a stack-allocated BACNET_ATOMIC_READ_FILE_DATA data structure. However, the stack object only has space for one fileData element. When the loop reaches i = 1, the code computes \u0026data-\u003efileData[1], which is already out of bounds, and the resulting invalid pointer is passed down to memmove(), causing a stack-buffer-overflow. This issue has been patched in versions 1.4.4 and 1.5.1."
          }
        ],
        "id": "CVE-2026-45265",
        "lastModified": "2026-11-12T22:09:39.233",
        "metrics": {
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        "vulnStatus": "Awaiting Analysis",
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            "type": "Primary"
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    }
  }
}



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