{"id":"PYSEC-2026-2266","details":"pydicom is a pure Python package for working with DICOM files. Versions 2.0.0-rc.1 through 3.0.1 are vulnerable to Path Traversal through a maliciously crafted DICOMDIR ReferencedFileID when it is set to a path outside the File-set root. pydicom resolves the path only to confirm that it exists, but does not verify that the resolved path remains under the File-set root. Subsequent public FileSet operations such as copy(), write(), and remove()+write(use_existing=True) use that unchecked path in file I/O operations. This allows arbitrary file read/copy and, in some flows, move/delete outside the File-set root. This issue has been fixed in version 3.0.2.","aliases":["CVE-2026-32711","GHSA-v856-2rf8-9f28"],"modified":"2026-07-13T07:15:41.176781370Z","published":"2026-03-20T02:16:33.600Z","references":[{"type":"ADVISORY","url":"https://github.com/pydicom/pydicom/releases/tag/v3.0.2"},{"type":"FIX","url":"https://github.com/pydicom/pydicom/commit/6414f01a053dff925578799f5a7208d2ae585e82"},{"type":"EVIDENCE","url":"https://github.com/pydicom/pydicom/security/advisories/GHSA-v856-2rf8-9f28"}],"affected":[{"package":{"name":"pydicom","ecosystem":"PyPI","purl":"pkg:pypi/pydicom"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"fixed":"3.0.2"}]}],"versions":["2.0.0","2.1.0","2.1.1","2.1.2","2.2.0","2.2.0rc1","2.2.1","2.2.2","2.3.0","2.3.1","2.4.0","2.4.1","2.4.2","2.4.3","2.4.4","2.4.5","3.0.0","3.0.0rc1","3.0.1"],"ecosystem_specific":{},"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/pydicom/PYSEC-2026-2266.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}