---
id: CVE-2025-4435
title: "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"
summary: "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 …"
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-682
published: '2025-06-03'
updated: '2026-07-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-4435'
references:
  - url: >-
      https://github.com/python/cpython/commit/19de092debb3d7e832e5672cc2f7b788d35951da
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/28463dba112af719df1e8b0391c46787ad756dd9
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/3612d8f51741b11f36f8fb0494d79086bac9390a
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/4633f3f497b1ff70e4a35b6fe2c907cbe2d4cb2e
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/9c1110ef6652687d7c55f590f909720eddde965a
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/9e0ac76d96cf80b49055f6d6b9a6763fb9215c2a
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/aa9eb5f757ceff461e6e996f12c89e5d9b583b01
    label: cna@python.org
  - url: >-
      https://github.com/python/cpython/commit/dd8f187d0746da151e0025c51680979ac5b4cfb1
    label: cna@python.org
  - url: 'https://github.com/python/cpython/issues/135034'
    label: cna@python.org
  - url: 'https://github.com/python/cpython/pull/135037'
    label: cna@python.org
  - url: >-
      https://mail.python.org/archives/list/security-announce@python.org/thread/MAXIJJCUUMCL7ATZNDVEGGHUMQMUUKLG/
    label: cna@python.org
tags:
  - nvd
epss: 0.0059
epssPercentile: 0.45872
ingestedAt: '2026-07-31T06:58:50.891Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.