CVE-2025-4517

Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data".

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.

Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data". 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.

Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation). Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.

Security Fix(es):

Python is an open source, object-oriented programming language from the Python Foundation. This language has the characteristics of scalability, supporting modules and packages, and supporting multiple platforms. There is a security vulnerability in Python 3.12 and later versions. This vulnerability originates from the tarfile module extraction filter function that allows modifying file metadata and permissions outside the extract directory.(CVE-2024-12718)

A vulnerability classified as critical was found in Python CPython up to 3.14.0b1 (Programming Language Software).The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.As an impact it is known to affect confidentiality.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4138)

A vulnerability, which was classified as critical, has been found in Python CPython up to 3.14.0b1 (Programming Language Software).Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Impacted is integrity, and availability.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4330)

A vulnerability has been found in Python CPython up to 3.14.0b1 (Programming Language Software) and classified as problematic.As an impact it is known to affect integrity.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4435)

A vulnerability, which was classified as critical, was found in Python CPython up to 3.14.0b1 (Programming Language Software).CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.This is going to have an impact on confidentiality, integrity, and availability.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4517)

Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation). Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.

Security Fix(es):

Python is an open source, object-oriented programming language from the Python Foundation. This language has the characteristics of scalability, supporting modules and packages, and supporting multiple platforms. There is a security vulnerability in Python 3.12 and later versions. This vulnerability originates from the tarfile module extraction filter function that allows modifying file metadata and permissions outside the extract directory.(CVE-2024-12718)

A vulnerability classified as critical was found in Python CPython up to 3.14.0b1 (Programming Language Software).The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.As an impact it is known to affect confidentiality.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4138)

A vulnerability, which was classified as critical, has been found in Python CPython up to 3.14.0b1 (Programming Language Software).Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Impacted is integrity, and availability.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4330)

A vulnerability has been found in Python CPython up to 3.14.0b1 (Programming Language Software) and classified as problematic.As an impact it is known to affect integrity.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4435)

A vulnerability, which was classified as critical, was found in Python CPython up to 3.14.0b1 (Programming Language Software).CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.This is going to have an impact on confidentiality, integrity, and availability.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4517)

Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation). Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.

Security Fix(es):

Python is an open source, object-oriented programming language from the Python Foundation. This language has the characteristics of scalability, supporting modules and packages, and supporting multiple platforms. There is a security vulnerability in Python 3.12 and later versions. This vulnerability originates from the tarfile module extraction filter function that allows modifying file metadata and permissions outside the extract directory.(CVE-2024-12718)

A vulnerability classified as critical was found in Python CPython up to 3.14.0b1 (Programming Language Software).The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.As an impact it is known to affect confidentiality.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4138)

A vulnerability, which was classified as critical, has been found in Python CPython up to 3.14.0b1 (Programming Language Software).Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Impacted is integrity, and availability.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4330)

A vulnerability has been found in Python CPython up to 3.14.0b1 (Programming Language Software) and classified as problematic.As an impact it is known to affect integrity.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4435)

A vulnerability, which was classified as critical, was found in Python CPython up to 3.14.0b1 (Programming Language Software).CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.This is going to have an impact on confidentiality, integrity, and availability.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4517)

Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation). Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.

Security Fix(es):

A vulnerability, which was classified as critical, was found in Python CPython up to 3.14.0b1 (Programming Language Software).CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.This is going to have an impact on confidentiality, integrity, and availability.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4517)

The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.(CVE-2025-6069)

Python combines remarkable power with very clear syntax. It has modules, classes, exceptions, very high level dynamic data types, and dynamic typing. There are interfaces to many system calls and libraries, as well as to various windowing systems. New built-in modules are easily written in C or C++ (or other languages, depending on the chosen implementation). Python is also usable as an extension language for applications written in other languages that need easy-to-use scripting or automation interfaces.

Security Fix(es):

A vulnerability, which was classified as critical, was found in Python CPython up to 3.14.0b1 (Programming Language Software).CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.This is going to have an impact on confidentiality, integrity, and availability.Upgrading to version 3.14.0b2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.(CVE-2025-4517)

The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.(CVE-2025-6069)

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)

• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)

• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)

• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)

• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)

• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)

• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)

• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)

• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)

• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)

• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)

• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)

• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)

• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)

• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)

• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)

• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)

• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)

• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)

• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)

• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)

• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)

• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)

• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)

• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)

• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)

• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)

• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)

• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• python: Invalid value for OpenSSL API may cause Buffer over-read when NPN is used (CVE-2024-5642)

• python: Virtual environment (venv) activation scripts don't quote paths (CVE-2024-9287)

• python: Improper validation of IPv6 and IPvFuture addresses (CVE-2024-11168)

• python: cpython: URL parser allowed square brackets in domain names (CVE-2025-0938)

• cpython: python: CPython DecodeError Handling Vulnerability (CVE-2025-4516)

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)

• cpython: python: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)

• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)

• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

• cpython: Python HTMLParser quadratic complexity (CVE-2025-6069)

• cpython: python: Python zipfile End of Central Directory (EOCD) Locator record offset not checked (CVE-2025-8291)

• python: Quadratic complexity in os.path.expandvars() with user-controlled template (CVE-2025-6075)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data". 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.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)
• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)
• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)
• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)
• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)
• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)
• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)
• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)
• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)
• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)
• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)
• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)
• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)
• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)
• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)
• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)
• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)
• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)
• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)
• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)
• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)
• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)
• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)
• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)
• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)
• cpython: Bypass extraction filter to modify file metadata outside extraction directory (CVE-2024-12718)
• cpython: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)
• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)
• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.

Security Fix(es):

• python: Invalid value for OpenSSL API may cause Buffer over-read when NPN is used (CVE-2024-5642)
• python: Virtual environment (venv) activation scripts don't quote paths (CVE-2024-9287)
• python: Improper validation of IPv6 and IPvFuture addresses (CVE-2024-11168)
• python: cpython: URL parser allowed square brackets in domain names (CVE-2025-0938)
• cpython: python: CPython DecodeError Handling Vulnerability (CVE-2025-4516)
• cpython: Tarfile extracts filtered members when errorlevel=0 (CVE-2025-4435)
• cpython: python: Extraction filter bypass for linking outside extraction directory (CVE-2025-4330)
• python: cpython: Arbitrary writes via tarfile realpath overflow (CVE-2025-4517)
• cpython: python: Bypassing extraction filter to create symlinks to arbitrary targets outside extraction directory (CVE-2025-4138)
• cpython: Python HTMLParser quadratic complexity (CVE-2025-6069)
• cpython: python: Python zipfile End of Central Directory (EOCD) Locator record offset not checked (CVE-2025-8291)
• python: Quadratic complexity in os.path.expandvars() with user-controlled template (CVE-2025-6075)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data".

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.

Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data".

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.

Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data".

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.

Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data".

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.

Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data".

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.

• CVE-2024-12718, CVE-2025-4138, CVE-2025-4330, CVE-2025-4435, CVE-2025-4517: fix multiple tarfile extraction filter bypasses (filter="tar"/filter="data")

• CVE-2024-12718, CVE-2025-4138, CVE-2025-4330, CVE-2025-4435, CVE-2025-4517: fix multiple tarfile extraction filter bypasses (filter="tar"/filter="data")

• CVE-2024-12718, CVE-2025-4138, CVE-2025-4330, CVE-2025-4435, CVE-2025-4517: fix multiple tarfile extraction filter bypasses (filter="tar"/filter="data")

• CVE-2024-12718, CVE-2025-4138, CVE-2025-4330, CVE-2025-4435, CVE-2025-4517: fix multiple tarfile extraction filter bypasses (filter="tar"/filter="data")

• CVE-2024-12718, CVE-2025-4138, CVE-2025-4330, CVE-2025-4435, CVE-2025-4517: fix multiple tarfile extraction filter bypasses (filter="tar"/filter="data")

• CVE-2024-12718, CVE-2025-4138, CVE-2025-4330, CVE-2025-4435, CVE-2025-4517: fix multiple tarfile extraction filter bypasses (filter="tar"/filter="data")