{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "1.4.6"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "1.5.0"
                  },
                  {
                    "fixed": "1.5.2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "introduced": "1.6.0"
                  },
                  {
                    "fixed": "1.6.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "92e503566c990269f85ee15370d88415ad7ff6fb"
            },
            {
              "introduced": "61a7a53bea5b5bc4724646abbce601fd26c364b6"
            },
            {
              "fixed": "d2468d56de3d156659a9051c95119e3a6e11c421"
            },
            {
              "introduced": "9bc3cfa07aab98852de432fa24079f4b4b6b7eed"
            },
            {
              "fixed": "7a53f0a72a92de1621d30fc63703a29afe12bfaf"
            }
          ],
          "repo": "https://github.com/bacnet-stack/bacnet-stack",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-4vgv-v5ph-rmxr"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100403.json"
  },
  "details": "BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.6, 1.5.2, and 1.6.1, the BACnet/SC hub's Linux WebSocket server reassembles fragmented WebSocket messages into a per-connection fragment_buffer. It grows that buffer with realloc() on every non-final frame, with no upper bound. A peer that streams binary continuation fragments and never sets FIN keeps the hub reallocating until the box runs out of memory or the process is OOM-killed. The buffer starts at the maximum legal BVLC-SC NPDU size, but nothing after that ties its growth back to that limit. This issue has been patched in versions 1.4.6, 1.5.2, 1.6.1, and 1.7.0.",
  "id": "CVE-2026-100403",
  "modified": "2026-11-14T10:30:53.631730773Z",
  "published": "2026-11-13T18:41:06.709Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100403.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/bacnet-stack/bacnet-stack/pull/1433"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-4vgv-v5ph-rmxr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-100403"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "BACnet Stack: BACnet/SC hub grows its WebSocket reassembly buffer without limit, so a peer can exhaust its memory"
}