{"id":"CVE-2020-15163","aliases":["GHSA-f8mr-jv2c-v8mg","PYSEC-2020-145"],"url":"https://o3.security/vulnerability/CVE-2020-15163","summary":"Invalid root may become trusted root in The Update Framework (TUF)","details":"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.","published":"2020-09-09T18:15:22.480Z","modified":"2026-08-27T08:40:05.253164Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"},"epss":{"score":0.0067,"percentile":0.48984,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"tuf","fixedVersion":"0.12.0"}],"fix":{"url":"https://github.com/theupdateframework/tuf/commit/3d342e648fbacdf43a13d7ba8886aaaf07334af7","label":"theupdateframework/tuf@3d342e6"},"references":[{"type":"ADVISORY","url":"https://github.com/theupdateframework/tuf/releases/tag/v0.12.0"},{"type":"ADVISORY","url":"https://github.com/theupdateframework/tuf/security/advisories/GHSA-f8mr-jv2c-v8mg"},{"type":"FIX","url":"https://github.com/theupdateframework/tuf/commit/3d342e648fbacdf43a13d7ba8886aaaf07334af7"},{"type":"FIX","url":"https://github.com/theupdateframework/tuf/pull/885"},{"type":"PACKAGE","url":"https://pypi.org/project/tuf"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-27T08:40:05.253164Z"}}