RustDesk Client Transmits Preset Address Book Password Verbatim in Heartbeat Sync

{
  "id": "ba4ad6ce6f7657dbb60df7df3294490c1dff7d1d338fbfa514612a3022bd8bba",
  "url": "https://osv.dev/vulnerability/CVE-2026-30796",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RustDesk Client Transmits Preset Address Book Password Verbatim in Heartbeat Sync",
    "summary": "Cleartext Transmission of Sensitive Information, Insufficiently Protected Credentials vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Address book sync, Heartbeat sync loop modules) allows Sniffing Attacks. The client places the preset address-book password verbatim into the heartbeat sync JSON body (src/hbbs_http/sync.rs). Over an intact HTTPS session it is not exposed in transit, but it is a reusable shared secret rather than a zero-knowledge proof, so it is recovered by any party that becomes the API endpoint - under the re-homed/rogue API server (CVE-2026-30797) - and the leaked credential then authorizes the server-side address book. This vulnerability is associated with program files src/hbbs_http/sync.rs and program routines heartbeat sync body builder (emits preset-address-book-password). This issue affects RustDesk Client: through 1.4.8.",
    "evidence": "osv:CVE-2026-30796",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-30796",
      "aliases": [
        "CVE-2026-30796"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rustdesk/rustdesk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "9ded8d6ab24779db3c9334f5a3d6a652b8425c4f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.4.8"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.4.8",
            "1.4.7",
            "1.4.6",
            "nightly",
            "1.4.5",
            "1.4.4",
            "1.4.3",
            "1.4.2",
            "1.4.1",
            "1.4.0",
            "1.3.9",
            "1.3.8",
            "1.3.7",
            "1.3.6",
            "1.3.5",
            "1.3.4",
            "1.3.3",
            "1.3.2",
            "1.3.1",
            "1.3.0",
            "1.2.7",
            "1.2.6",
            "1.2.5",
            "fdroid-version",
            "1.2.4",
            "1.2.3-2",
            "1.2.3-1",
            "1.2.3",
            "1.2.2",
            "1.2.1",
            "1.2.0",
            "1.1.9",
            "1.1.8",
            "1.1.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30796.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.882836033Z",
      "provider": "osv",
      "references": [
        "https://github.com/rustdesk/rustdesk,https://github.com/rustdesk/hbb_common",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30796.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-30796",
        "https://www.vulsec.org/",
        "https://github.com/rustdesk/rustdesk/releases",
        "https://rustdesk.com/docs/en/",
        "https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pub"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-522"
        ],
        "cna_assigner": "VULSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30796.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-30796",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492575,
  "published_at": "2026-03-05T15:30:39.605+00:00"
}