nanoMODBUS Off-by-One Buffer Overflow in recv_msg_header() via Crafted MBAP Length Field

{
  "id": "d78be6f631f5e4115132ebb0e5d4d62eba29bda5cb61268527a9fa8e92e8a710",
  "url": "https://osv.dev/vulnerability/CVE-2026-54410",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nanoMODBUS Off-by-One Buffer Overflow in recv_msg_header() via Crafted MBAP Length Field",
    "summary": "nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255.",
    "evidence": "osv:CVE-2026-54410",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-54410",
      "aliases": [
        "CVE-2026-54410"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:P/AU:Y"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/debevv/nanomodbus",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "91d6782930ee263bc760f27b0cbc5b82773c5f0d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.23.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.23.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.23.0",
            "v1.22.1",
            "v1.22.0",
            "v1.21.0",
            "v1.20.1",
            "v1.20.0",
            "v1.19.0",
            "v1.18.1",
            "v1.17.3",
            "v1.17.2",
            "v1.17.1",
            "v1.17.0",
            "v1.16.0",
            "v1.15.0",
            "v1.14.3",
            "v1.14.2",
            "v1.14.1",
            "v1.14.0",
            "v1.13.0",
            "v1.12.1",
            "v1.12.0",
            "v1.11.0",
            "v1.10.0",
            "v1.9.1",
            "v1.9.0",
            "v1.8.1",
            "v1.8.0",
            "v1.7.0",
            "v1.6.0",
            "v1.5.0",
            "v1.4.0",
            "v1.3.1",
            "v1.3.0",
            "v1.2.1",
            "v1.2.0",
            "v1.1.1",
            "v1.1.0",
            "v1.0.1",
            "v1.0.0",
            "v1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54410.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.459503519Z",
      "provider": "osv",
      "references": [
        "https://github.com/debevv/nanoMODBUS/blob/v1.23.0/nanomodbus.c#L369",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54410.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54410",
        "https://github.com/debevv/nanoMODBUS",
        "https://cwe.mitre.org/data/definitions/193.html",
        "https://cwe.mitre.org/data/definitions/787.html"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-193",
          "CWE-787"
        ],
        "cna_assigner": "TuranSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54410.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54410",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492943,
  "published_at": "2026-06-14T17:10:12.275+00:00"
}