CVE-2025-4435 - CVE House
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Status published High CVE-2025-4435

Tarfile extracts filtered members when errorlevel=0

Vulnerability Description

When using a TarFile.errorlevel = 0 and extracting with a filter the documented behavior is that any filtered members would be skipped and not extracted. However the actual behavior of TarFile.errorlevel = 0 in affected versions is that the member would still be extracted and not skipped.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Chuck Woodraska
  • Petr Viktorin
  • Serhiy Storchaka
  • Hugo van Kemenade
  • Łukasz Langa
  • Thomas Wouters
  • Seth Larson
  • Matt Prodani

References

More from Python Software Foundation

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CVE-2025-6075
Quadratic complexity in os.path.expandvars() with user-controlled template
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CVE-2025-6069
HTMLParser quadratic complexity when processing malformed inputs
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CVE-2025-4517
Arbitrary writes via tarfile realpath overflow
Critical 9.4

Affected Vendor

Python Software Foundation

View all reports →

Affected Software

CPython
Vulnerable Versions:
0, 3.11.0, 3.12.0, 3.13.0, 3.14.0a1

Timeline

Official Publish: June 3rd, 2025
Last Modified: April 21st, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.