Security advisory

{
  "id": "804fcebab2c2a78b1626087d167c635bc0846c224b2b7addecaea4869232980e",
  "url": "https://osv.dev/vulnerability/CVE-2020-15163",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-15163",
    "summary": "Python TUF (The Update Framework) reference implementation before version 0.12 it will incorrectly trust a previously downloaded root metadata file which failed verification at download time. This allows an attacker who is able to serve multiple new versions of root metadata (i.e. by a person-in-the-middle attack) culminating in a version which has not been correctly signed to control the trust chain for future updates. This is fixed in version 0.12 and newer.",
    "evidence": "osv:CVE-2020-15163",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-15163",
      "aliases": [
        "CVE-2020-15163",
        "GHSA-f8mr-jv2c-v8mg",
        "PYSEC-2020-145"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/theupdateframework/python-tuf",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "61383951147df1dc352bdc95644f8a51c94cd12c"
                },
                {
                  "fixed": "3d342e648fbacdf43a13d7ba8886aaaf07334af7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:linuxfoundation:the_update_framework:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.12.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3d342e648fbacdf43a13d7ba8886aaaf07334af7"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "61383951147df1dc352bdc95644f8a51c94cd12c"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.12.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.11.2.dev3",
            "v0.11.2.dev2",
            "v0.11.2.dev1",
            "v0.11.1",
            "v0.11.0",
            "v0.10.2",
            "v0.10.0",
            "v0.9.9",
            "v0.9.8",
            "v0.7.5"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15163.json"
          }
        }
      ],
      "modified": "2026-10-20T10:49:45.075006493Z",
      "provider": "osv",
      "references": [
        "https://github.com/theupdateframework/tuf/releases/tag/v0.12.0",
        "https://github.com/theupdateframework/tuf/security/advisories/GHSA-f8mr-jv2c-v8mg",
        "https://github.com/theupdateframework/tuf/commit/3d342e648fbacdf43a13d7ba8886aaaf07334af7",
        "https://github.com/theupdateframework/tuf/pull/885",
        "https://pypi.org/project/tuf"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-15163",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 380770,
  "published_at": "2020-09-09T18:15:22.48+00:00"
}