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Path TraversalWeakness · CWE-22

CVE-2025-4330

HIGH · 7.5 CVSS v3.1 Published 2025-06-03
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Allows the extraction filter to be ignored, allowing symlink targets to point outside the destination directory, and the modification of some file metadata. You are affected by this vulnerability if using the tarfile module to extract untrusted tar archives using TarFile.extractall() or TarFile.extract() using the filter= parameter with a value of "data" or "tar". See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter  for more information. Note that for Python 3.14 or later the default value of filter= changed from "no filtering" to `"data", so if you are relying on this new default behavior then your usage is also affected. Note that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links.

In the news

Third-party coverage
Trending covered by 2 outlets this week · latest 12mo ago

Surfaced from public web coverage — external links open in a new tab.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-22

A file path is built from user input without being confined, so sequences like “../” let an attacker step outside the intended directory. That can expose configuration, credentials, or source code, and in the worst case lets an attacker write files where they shouldn't. A durable fix resolves and canonicalises the path, then rejects anything that escapes a known-safe base directory.

General guidance for the path traversal class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix Moderate confidence

Python 3.13.x or later (check https://www.python.org/downloads/ for the latest stable release containing the security fix)

  1. 1. Identify your current Python version by running: python3 --version
  2. 2. Determine if your version is affected: Python versions prior to the fixed release are vulnerable when using TarFile.extractall() or TarFile.extract() with filter='data' or filter='tar'
  3. 3. For Python 3.14+: The default filter changed to 'data', making extraction vulnerable even without explicit filter parameter
  4. 4. Download the latest stable Python release from https://www.python.org/downloads/ or use your system package manager
  5. 5. Install the updated Python version (upgrade to Python 3.13.x or 3.14.x depending on which contains the security fix)
  6. 6. Verify the fix by checking the tarfile module behavior: ensure symlinks outside the extraction directory are properly blocked
  7. 7. If immediate upgrade is not possible, implement manual validation: check tarinfo for suspicious paths and symlink targets before extraction
Caveat Upgrading Python may require verification of existing code compatibility, especially if relying on previous default filter behavior (no filtering in <3.14)

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-4330 in production — separate from our analysis above.

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