Cloudanix VulnDB

CVE-2025-4435

High · 7.5

CVSS

7.5

EPSS

0.6%

Published

Jun 3, 2025

CISA due date

—

Cloudanix analysis

Schedule a fix SSVC: Track

Python's tar file tool can pull in files it was supposed to ignore when certain settings are used, letting unwanted content slip onto the system.

Exploitation
Remote Unauthenticated
Attacker needs
None
Complexity
Low
Impact
Data Tampering
Component
Library
Class
Authorization Bypass
Remediation
Upgrade
Effort
Medium
Patch risk
Low

What it actually does

TarFile extraction with errorlevel=0 and an active filter fails to skip filtered members as documented, causing those members to be written to disk anyway.

Why it matters to the business

Applications that rely on tar filters to safely handle untrusted archives may extract malicious or unauthorized files, resulting in integrity violations or downstream compromise.

How an attack unfolds

An attacker supplies a tar archive containing members that a filter is intended to block; when the victim code uses TarFile.errorlevel=0, the filter is bypassed and the members are extracted to the filesystem.

How to fix it

Upgrade python/cpython to commit 19de092debb3d7e832e5672cc2f7b788d35951da or later; avoid errorlevel=0 when filters are in use until patched.

How to confirm the fix worked

Confirm the source tree contains commit 19de092debb3d7e832e5672cc2f7b788d35951da; test that filtered members are now skipped under errorlevel=0.

Typical attack path

  1. Deliver crafted tar archive to application using tarfile.extract with filter and errorlevel=0
  2. Trigger extraction path that should skip filtered members
  3. Members are written despite filter, achieving unauthorized file placement

How to detect it

Review application logs and file-system change events around tar extraction routines for files that should have been filtered; correlate with inbound archive processing.

What your security team should do

  • Apply the listed commit or newer Python builds immediately
  • Audit all code paths that call TarFile.extract with filters
  • Add runtime checks or wrappers that enforce skip behavior for untrusted archives

The record

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.

Affected packages

Ecosystem Package Introduced Fixed
AlmaLinux:10 python-unversioned-command 0 3.12.9-2.el10_0.2
AlmaLinux:10 python3 0 3.12.9-2.el10_0.2
AlmaLinux:10 python3-debug 0 3.12.9-2.el10_0.2
AlmaLinux:10 python3-devel 0 3.12.9-2.el10_0.2
AlmaLinux:10 python3-idle 0 3.12.9-2.el10_0.2
AlmaLinux:10 python3-libs 0 3.12.9-2.el10_0.2
AlmaLinux:10 python3-test 0 3.12.9-2.el10_0.2
AlmaLinux:10 python3-tkinter 0 3.12.9-2.el10_0.2
AlmaLinux:8 platform-python 0 3.6.8-70.el8_10.alma.1
AlmaLinux:8 platform-python-debug 0 3.6.8-70.el8_10.alma.1
AlmaLinux:8 platform-python-devel 0 3.6.8-70.el8_10.alma.1
AlmaLinux:8 python3-idle 0 3.6.8-70.el8_10.alma.1
AlmaLinux:8 python3-libs 0 3.6.8-70.el8_10.alma.1
AlmaLinux:8 python3-test 0 3.6.8-70.el8_10.alma.1
AlmaLinux:8 python3-tkinter 0 3.6.8-70.el8_10.alma.1
AlmaLinux:8 python3.11 0 3.11.13-1.el8_10
AlmaLinux:8 python3.11-debug 0 3.11.13-1.el8_10
AlmaLinux:8 python3.11-devel 0 3.11.13-1.el8_10
AlmaLinux:8 python3.11-idle 0 3.11.13-1.el8_10
AlmaLinux:8 python3.11-libs 0 3.11.13-1.el8_10
AlmaLinux:8 python3.11-rpm-macros 0 3.11.13-1.el8_10
AlmaLinux:8 python3.11-test 0 3.11.13-1.el8_10
AlmaLinux:8 python3.11-tkinter 0 3.11.13-1.el8_10
AlmaLinux:8 python3.12 0 3.12.11-1.el8_10
AlmaLinux:8 python3.12-debug 0 3.12.11-1.el8_10
AlmaLinux:8 python3.12-devel 0 3.12.11-1.el8_10
AlmaLinux:8 python3.12-idle 0 3.12.11-1.el8_10
AlmaLinux:8 python3.12-libs 0 3.12.11-1.el8_10
AlmaLinux:8 python3.12-rpm-macros 0 3.12.11-1.el8_10
AlmaLinux:8 python3.12-test 0 3.12.11-1.el8_10
AlmaLinux:8 python3.12-tkinter 0 3.12.11-1.el8_10
AlmaLinux:8 python39 0 3.9.25-2.module_el8.10.0+4083+53cad1fb
AlmaLinux:8 python39-Cython 0 0.29.21-5.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-Cython 0 0.29.21-5.module_el8.6.0+3248+c431e88c
AlmaLinux:8 python39-PyMySQL 0 0.10.1-2.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-attrs 0 20.3.0-2.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-cffi 0 1.14.3-2.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-cffi 0 1.14.3-2.module_el8.6.0+3248+c431e88c
AlmaLinux:8 python39-chardet 0 3.0.4-19.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-cryptography 0 3.3.1-3.module_el8.10.0+3765+2f9a457d
AlmaLinux:8 python39-debug 0 3.9.25-2.module_el8.10.0+4083+53cad1fb
AlmaLinux:8 python39-devel 0 3.9.25-2.module_el8.10.0+4083+53cad1fb
AlmaLinux:8 python39-idle 0 3.9.25-2.module_el8.10.0+4083+53cad1fb
AlmaLinux:8 python39-idna 0 2.10-4.module_el8.10.0+3849+a48d89aa
AlmaLinux:8 python39-iniconfig 0 1.1.1-2.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-libs 0 3.9.25-2.module_el8.10.0+4083+53cad1fb
AlmaLinux:8 python39-lxml 0 4.6.5-1.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-lxml 0 4.6.5-1.module_el8.6.0+3248+c431e88c
AlmaLinux:8 python39-mod_wsgi 0 4.7.1-7.module_el8.10.0+3989+a618fe15.1
AlmaLinux:8 python39-more-itertools 0 8.5.0-2.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-numpy 0 1.19.4-3.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-numpy 0 1.19.4-3.module_el8.6.0+3248+c431e88c
AlmaLinux:8 python39-numpy-doc 0 1.19.4-3.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-numpy-f2py 0 1.19.4-3.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-numpy-f2py 0 1.19.4-3.module_el8.6.0+3248+c431e88c
AlmaLinux:8 python39-packaging 0 20.4-4.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-pip 0 20.2.4-9.module_el8.10.0+3765+2f9a457d
AlmaLinux:8 python39-pip-wheel 0 20.2.4-9.module_el8.10.0+3765+2f9a457d
AlmaLinux:8 python39-pluggy 0 0.13.1-3.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-ply 0 3.11-10.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-psutil 0 5.8.0-4.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-psutil 0 5.8.0-4.module_el8.6.0+3248+c431e88c
AlmaLinux:8 python39-psycopg2 0 2.8.6-3.module_el8.10.0+3765+2f9a457d
AlmaLinux:8 python39-psycopg2-doc 0 2.8.6-3.module_el8.10.0+3765+2f9a457d
AlmaLinux:8 python39-psycopg2-tests 0 2.8.6-3.module_el8.10.0+3765+2f9a457d
AlmaLinux:8 python39-py 0 1.10.0-1.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-pybind11 0 2.7.1-1.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-pybind11 0 2.7.1-1.module_el8.6.0+3248+c431e88c
AlmaLinux:8 python39-pybind11-devel 0 2.7.1-1.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-pybind11-devel 0 2.7.1-1.module_el8.6.0+3248+c431e88c
AlmaLinux:8 python39-pycparser 0 2.20-3.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-pyparsing 0 2.4.7-5.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-pysocks 0 1.7.1-4.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-pytest 0 6.0.2-2.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-pyyaml 0 5.4.1-1.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-pyyaml 0 5.4.1-1.module_el8.6.0+3248+c431e88c
AlmaLinux:8 python39-requests 0 2.25.0-3.module_el8.9.0+3634+fb2a896c
AlmaLinux:8 python39-rpm-macros 0 3.9.25-2.module_el8.10.0+4083+53cad1fb
AlmaLinux:8 python39-scipy 0 1.5.4-5.module_el8.9.0+3634+fb2a896c
AlmaLinux:8 python39-setuptools 0 50.3.2-7.module_el8.10.0+4040+9207bbc0
AlmaLinux:8 python39-setuptools-wheel 0 50.3.2-7.module_el8.10.0+4040+9207bbc0
AlmaLinux:8 python39-six 0 1.15.0-3.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-test 0 3.9.25-2.module_el8.10.0+4083+53cad1fb
AlmaLinux:8 python39-tkinter 0 3.9.25-2.module_el8.10.0+4083+53cad1fb
AlmaLinux:8 python39-toml 0 0.10.1-5.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-urllib3 0 1.25.10-5.module_el8.10.0+3765+2f9a457d
AlmaLinux:8 python39-wcwidth 0 0.2.5-3.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-wheel 0 1:0.35.1-4.module_el8.6.0+2780+a40f65e1
AlmaLinux:8 python39-wheel-wheel 0 1:0.35.1-4.module_el8.6.0+2780+a40f65e1
AlmaLinux:9 python-unversioned-command 0 3.9.21-2.el9_6.1
AlmaLinux:9 python3 0 3.9.21-2.el9_6.1
AlmaLinux:9 python3-debug 0 3.9.21-2.el9_6.1
AlmaLinux:9 python3-devel 0 3.9.21-2.el9_6.1
AlmaLinux:9 python3-idle 0 3.9.21-2.el9_6.1
AlmaLinux:9 python3-libs 0 3.9.21-2.el9_6.1
AlmaLinux:9 python3-test 0 3.9.21-2.el9_6.1
AlmaLinux:9 python3-tkinter 0 3.9.21-2.el9_6.1
AlmaLinux:9 python3.11 0 3.11.11-2.el9_6.1
AlmaLinux:9 python3.11-debug 0 3.11.11-2.el9_6.1
AlmaLinux:9 python3.11-devel 0 3.11.11-2.el9_6.1
AlmaLinux:9 python3.11-idle 0 3.11.11-2.el9_6.1
AlmaLinux:9 python3.11-libs 0 3.11.11-2.el9_6.1
AlmaLinux:9 python3.11-test 0 3.11.11-2.el9_6.1
AlmaLinux:9 python3.11-tkinter 0 3.11.11-2.el9_6.1
AlmaLinux:9 python3.12 0 3.12.9-1.el9_6.1
AlmaLinux:9 python3.12-debug 0 3.12.9-1.el9_6.1
AlmaLinux:9 python3.12-devel 0 3.12.9-1.el9_6.1
AlmaLinux:9 python3.12-idle 0 3.12.9-1.el9_6.1
AlmaLinux:9 python3.12-libs 0 3.12.9-1.el9_6.1
AlmaLinux:9 python3.12-test 0 3.12.9-1.el9_6.1
AlmaLinux:9 python3.12-tkinter 0 3.12.9-1.el9_6.1
Bitnami libpython 0 3.9.23
Bitnami python 0 3.9.23
Bitnami python-min 0 3.9.23
Chainguard python-3.13 0 3.13.4-r0
Chainguard python-3.13-base 0 3.13.4-r0
Chainguard python-3.13-base-dev 0 3.13.4-r0
Chainguard python-3.13-dev 0 3.13.4-r0
Chainguard python-3.13-doc 0 3.13.4-r0
Chainguard python-3.13-privileged-netbindservice 0 3.13.4-r0
Chainguard python-3.13-tk 0 3.13.4-r0
Debian:11 jython 0 No fix
Debian:11 python2.7 0 No fix
Debian:12 jython 0 No fix
Debian:12 pypy3 0 No fix
Debian:12 python3.11 0 No fix
Debian:13 jython 0 No fix
Debian:13 pypy3 0 No fix
Debian:13 python3.13 0 No fix
Debian:14 pypy3 0 No fix
Debian:14 python3.13 0 3.13.4-1
Mageia:9 python3 0 3.10.18-1.4.mga9
SUSE:Enterprise Storage 7.1 python3 0 3.6.15-150300.10.97.2
SUSE:Enterprise Storage 7.1 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Micro 5.2 python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Micro 5.2 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Micro 5.3 python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Micro 5.3 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Micro 5.4 python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Micro 5.4 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Micro 5.5 python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Micro 5.5 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6 python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Module for Basesystem 15 SP6 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Module for Basesystem 15 SP6 python311-core 0 3.11.13-150600.3.35.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7 python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Module for Basesystem 15 SP7 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7 python311-core 0 3.11.13-150600.3.35.1
SUSE:Linux Enterprise Module for Development Tools 15 SP6 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Module for Python 3 15 SP6 python311 0 3.11.13-150600.3.35.2
SUSE:Linux Enterprise Module for Python 3 15 SP6 python311-core 0 3.11.13-150600.3.35.1
SUSE:Linux Enterprise Module for Python 3 15 SP6 python312 0 3.12.11-150600.3.33.1
SUSE:Linux Enterprise Module for Python 3 15 SP6 python312-core 0 3.12.11-150600.3.33.1
SUSE:Linux Enterprise Module for Python 3 15 SP7 python311 0 3.11.13-150600.3.35.2
SUSE:Linux Enterprise Module for Python 3 15 SP7 python311-core 0 3.11.13-150600.3.35.1
SUSE:Linux Enterprise Server 12 SP5-LTSS python36 0 3.6.15-84.1
SUSE:Linux Enterprise Server 12 SP5-LTSS python36-core 0 3.6.15-84.1
SUSE:Linux Enterprise Server 15 SP3-LTSS python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Server 15 SP3-LTSS python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Server 15 SP4-LTSS python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Server 15 SP4-LTSS python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Server 15 SP5-LTSS python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Server 15 SP5-LTSS python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 python36 0 3.6.15-84.1
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 python36-core 0 3.6.15-84.1
SUSE:Linux Enterprise Server for SAP Applications 15 SP3 python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Server for SAP Applications 15 SP3 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Server for SAP Applications 15 SP4 python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Server for SAP Applications 15 SP4 python3-core 0 3.6.15-150300.10.97.1
SUSE:Linux Enterprise Server for SAP Applications 15 SP5 python3 0 3.6.15-150300.10.97.2
SUSE:Linux Enterprise Server for SAP Applications 15 SP5 python3-core 0 3.6.15-150300.10.97.1
SUSE:Manager Proxy 4.3 python3 0 3.6.15-150300.10.97.2
SUSE:Manager Proxy 4.3 python3-core 0 3.6.15-150300.10.97.1
SUSE:Manager Server 4.3 python3 0 3.6.15-150300.10.97.2
SUSE:Manager Server 4.3 python3-core 0 3.6.15-150300.10.97.1
Wolfi python-3.13 0 3.13.4-r0
Wolfi python-3.13-base 0 3.13.4-r0
Wolfi python-3.13-base-dev 0 3.13.4-r0
Wolfi python-3.13-dev 0 3.13.4-r0
Wolfi python-3.13-doc 0 3.13.4-r0
Wolfi python-3.13-privileged-netbindservice 0 3.13.4-r0
Wolfi python-3.13-tk 0 3.13.4-r0
openSUSE:Leap 15.6 python3 0 3.6.15-150300.10.97.2
openSUSE:Leap 15.6 python3-core 0 3.6.15-150300.10.97.1
openSUSE:Leap 15.6 python3-documentation 0 3.6.15-150300.10.97.1
openSUSE:Leap 15.6 python311 0 3.11.13-150600.3.35.2
openSUSE:Leap 15.6 python311-core 0 3.11.13-150600.3.35.1
openSUSE:Leap 15.6 python311-documentation 0 3.11.13-150600.3.35.1
openSUSE:Leap 15.6 python312 0 3.12.11-150600.3.33.1

Related vulnerabilities