RustDesk < 1.4.7 Uncontrolled Memory Allocation DoS via BytesCodec

{
  "id": "1072553fa5f0565aa2487aad47d12de1d66a62b5a99541a97c2e3059b818b51a",
  "url": "https://osv.dev/vulnerability/CVE-2026-73108",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RustDesk < 1.4.7 Uncontrolled Memory Allocation DoS via BytesCodec",
    "summary": "RustDesk versions before 1.4.7 contain an uncontrolled speculative memory allocation vulnerability in BytesCodec. Before authentication, the decoder trusts the payload length encoded in a four-byte frame header and reserves that amount before receiving the payload. A crafted header can request up to 1,073,741,823 bytes of capacity, allowing unauthenticated attackers to use concurrent TCP connections to cause memory exhaustion and denial of service. The fix caps header-triggered speculative preallocation at 256 KiB.",
    "evidence": "osv:CVE-2026-73108",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-73108",
      "aliases": [
        "CVE-2026-73108"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rustdesk/hbb_common",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "547da54b4ee58eed47163fbd47edb4639e3d88de"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "547da54b4ee58eed47163fbd47edb4639e3d88de"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            },
            {
              "repo": "https://github.com/rustdesk/rustdesk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0c86d4616298f09435f6236599b300964aa61460"
                },
                {
                  "fixed": "518296f2570d107ad416f29ade5fcce3177f4115"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.4.7"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0c86d4616298f09435f6236599b300964aa61460"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "1.4.7"
                  },
                  {
                    "range": [
                      {
                        "fixed": "518296f2570d107ad416f29ade5fcce3177f4115"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "driver",
            "dirver",
            "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-2026-73108.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.488966386Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73108.json",
        "https://github.com/rustdesk/rustdesk/releases/tag/1.4.7",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-73108",
        "https://www.vulncheck.com/advisories/rustdesk-uncontrolled-memory-allocation-dos-via-bytescodec",
        "https://github.com/rustdesk/hbb_common/commit/547da54b4ee58eed47163fbd47edb4639e3d88de",
        "https://github.com/rustdesk/rustdesk/commit/518296f2570d107ad416f29ade5fcce3177f4115",
        "https://github.com/rustdesk/rustdesk"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73108.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-73108",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498624,
  "published_at": "2026-08-26T13:00:29.283+00:00"
}