OnionShare follows symlinks in shared directories, allowing unintended disclosure of local files

{
  "id": "f838ec029996bde004f40f93799ed62e394bb17870bd8d0610ffb7bbbdc03206",
  "url": "https://osv.dev/vulnerability/CVE-2026-54706",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OnionShare follows symlinks in shared directories, allowing unintended disclosure of local files",
    "summary": "OnionShare is an open source tool that lets you securely and anonymously share files, host websites, and chat with friends using the Tor network. Prior to 2.6.4, OnionShare CLI/Desktop follows symbolic links in cli/onionshare_cli/web/send_base_mode.py through SendBaseModeWeb.set_file_info() and stream_individual_file(), allowing remote recipients of Share or Website mode to read local files outside the selected directory. This issue is fixed in version 2.6.4.",
    "evidence": "osv:CVE-2026-54706",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-54706",
      "aliases": [
        "CVE-2026-54706",
        "GHSA-22p9-r2f5-22mf",
        "PYSEC-2026-3585"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/onionshare/onionshare",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "abc798f3fc449154f31509c7ec23267db0ebeefc"
                },
                {
                  "fixed": "48f31cfac077fcc9c04c67c2a6dbf87d956f5eec"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.6.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "48f31cfac077fcc9c04c67c2a6dbf87d956f5eec"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "abc798f3fc449154f31509c7ec23267db0ebeefc"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.6.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.6.3",
            "v0.9",
            "v0.8.1",
            "0.8",
            "0.7.1",
            "0.7",
            "0.6",
            "0.5",
            "0.4",
            "0.3",
            "0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54706.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.984933873Z",
      "provider": "osv",
      "references": [
        "https://github.com/onionshare/onionshare/releases/tag/v2.6.4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54706.json",
        "https://github.com/onionshare/onionshare/security/advisories/GHSA-22p9-r2f5-22mf",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54706",
        "https://github.com/onionshare/onionshare/commit/48f31cfac077fcc9c04c67c2a6dbf87d956f5eec"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-59"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54706.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54706",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495751,
  "published_at": "2026-07-31T16:30:58.062+00:00"
}