deskflow — security advisory

{
  "id": "22fde4ba08f5ee17adba8090c52581011c89b067a9793c70384072324816a781",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-65976",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-65976",
    "summary": "Deskflow is a keyboard and mouse sharing app. From 1.17.0 until continuous build 1.26.0.300, a connected peer can send repeated DCLP DataChunk messages to ClipboardChunk::assemble() in src/lib/deskflow/ClipboardChunk.cpp, causing the server path in src/lib/server/ClientProxy1_6.cpp or client path in src/lib/client/ServerProxy.cpp to append data beyond the DataStart declared size and configured clipboard limit before DataEnd validation, exhausting receiver memory. This issue is fixed in continuous build 1.26.0.300.",
    "evidence": "osv:UBUNTU-CVE-2026-65976",
    "products": [
      {
        "name": {
          "value": "deskflow",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.26.0+dfsg-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.26.0+dfsg-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.26.0+dfsg-5ubuntu1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "1.27.0+dfsg-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "deskflow",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.23.0+dfsg-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.24.0+dfsg-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.25.0+dfsg-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.25.0+dfsg-3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "1.26.0+dfsg-1",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2026-65976",
      "aliases": [
        "UBUNTU-CVE-2026-65976"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "deskflow",
            "purl": "pkg:deb/ubuntu/deskflow?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "1.26.0+dfsg-1",
            "1.26.0+dfsg-3",
            "1.26.0+dfsg-5ubuntu1",
            "1.27.0+dfsg-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65976.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "deskflow",
                "binary_version": "1.27.0+dfsg-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "deskflow",
            "purl": "pkg:deb/ubuntu/deskflow?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "1.23.0+dfsg-1",
            "1.24.0+dfsg-2",
            "1.25.0+dfsg-2",
            "1.25.0+dfsg-3",
            "1.26.0+dfsg-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-65976.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "deskflow",
                "binary_version": "1.26.0+dfsg-1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:59:17.680727457Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-65976"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-65976",
        "https://www.cve.org/CVERecord?id=CVE-2026-65976",
        "https://github.com/deskflow/deskflow/commit/8a535fd5dd48315eaaf6b93d5c7534d0592addef",
        "https://github.com/deskflow/deskflow/commit/bcd3a658fc3b2ad735146fdc9efefa9462d195b7",
        "https://github.com/deskflow/deskflow/security/advisories/GHSA-jf7g-qghg-p54x"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-65976",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 359602,
  "published_at": "2026-08-17T21:16:00+00:00"
}