{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "1.4.2"
                  },
                  {
                    "fixed": "1.4.5"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "1.5.0"
                  },
                  {
                    "fixed": "1.5.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          },
          "events": [
            {
              "introduced": "0682428c867c50895844d914e0f70be5c67ec917"
            },
            {
              "fixed": "289b90d8d109b00594667a82007255bb71b36a6b"
            },
            {
              "introduced": "61a7a53bea5b5bc4724646abbce601fd26c364b6"
            },
            {
              "fixed": "3a74c74a8139526e34da32c6cc41ed7c71aaded5"
            }
          ],
          "repo": "https://github.com/bacnet-stack/bacnet-stack",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-8759-hx7g-94qx"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-125",
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49990.json"
  },
  "details": "BACnet Stack is a BACnet open source protocol stack C library for embedded systems. From versions 1.4.2 to before 1.4.5, and 1.5.0 to before 1.5.1, a signed fileStartPosition taken from AtomicReadFile and AtomicWriteFile stream-access requests is not validated tightly enough before it reaches the RAM file backends. Practical impact includes: reliable denial of service via process crash, out-of-bounds read that may expose adjacent memory contents, or out-of-bounds write that may corrupt heap memory and destabilize the process. This issue has been patched in versions 1.4.5 and 1.5.1.",
  "id": "CVE-2026-49990",
  "modified": "2026-11-14T10:30:55.963059478Z",
  "published": "2026-11-13T15:54:22.681Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49990.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/bacnet-stack/bacnet-stack/pull/1362"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-8759-hx7g-94qx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49990"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "BACnet Stack: AtomicReadFile/AtomicWriteFile stream fileStartPosition validation flaw causes out-of-bounds read/write in RAM file backends"
}