CVE-2025-8194
Apache CPython TarFile Infinite Loop Deadlock
Description
There is a defect in the CPython “tarfile” module affecting the “TarFile” extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives. This vulnerability can be mitigated by including the following patch after importing the “tarfile” module: https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1
INFO
Published Date :
July 28, 2025, 7:15 p.m.
Last Modified :
July 29, 2025, 2:15 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-8194.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-8194 vulnerability anywhere in the article.
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Daily CyberSecurity
Python Tarfile Vulnerability (CVE-2025-8194) Allows DoS via Malicious Archives
A newly discovered vulnerability in Python’s tarfile module, identified as CVE-2025-8194, threatens to hang applications that process malicious archive files—triggering infinite loops and potential de ... Read more
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Daily CyberSecurity
Linux Kernel 6.16 Released: Boosting Hardware Support, Filesystems, & Networking
Version 6.16 of the Linux Kernel has now been officially released. As this is not a Long-Term Support (LTS) release, its lifecycle is relatively short, making it more suitable for rolling installation ... Read more
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Daily CyberSecurity
PyPI Warns of Sophisticated Phishing Campaign Targeting Python Developers
The Python Package Index (PyPI), the central repository for Python developers around the world, has issued a security warning regarding an ongoing phishing attack aimed at tricking project maintainers ... Read more
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Daily CyberSecurity
QWINS LTD, The Suspected Bulletproof Hosting Provider Fueling Global Malware Campaigns
In a deep-dive into the infrastructure powering some of today’s most prevalent malware campaigns, security researcher Vasilis Orlof uncovers a suspected bulletproof hosting provider operating under th ... Read more
The following table lists the changes that have been made to the
CVE-2025-8194 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by [email protected]
Jul. 29, 2025
Action Type Old Value New Value Changed Description There is a defect in the CPython “tarfile” module affecting the “TarFile” extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives. This vulnerability can be mitigated by including the following patch after importing the “tarfile” module: import tarfile def _block_patched(self, count): if count < 0: # pragma: no cover raise tarfile.InvalidHeaderError("invalid offset") return _block_patched._orig_block(self, count) _block_patched._orig_block = tarfile.TarInfo._block tarfile.TarInfo._block = _block_patched There is a defect in the CPython “tarfile” module affecting the “TarFile” extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives. This vulnerability can be mitigated by including the following patch after importing the “tarfile” module: https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1 Added Reference https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1 -
CVE Modified by [email protected]
Jul. 28, 2025
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38 Added Reference https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fe -
New CVE Received by [email protected]
Jul. 28, 2025
Action Type Old Value New Value Added Description There is a defect in the CPython “tarfile” module affecting the “TarFile” extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives. This vulnerability can be mitigated by including the following patch after importing the “tarfile” module: import tarfile def _block_patched(self, count): if count < 0: # pragma: no cover raise tarfile.InvalidHeaderError("invalid offset") return _block_patched._orig_block(self, count) _block_patched._orig_block = tarfile.TarInfo._block tarfile.TarInfo._block = _block_patched Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-835 Added Reference https://github.com/python/cpython/issues/130577 Added Reference https://github.com/python/cpython/pull/137027 Added Reference https://mail.python.org/archives/list/[email protected]/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-8194 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-8194
weaknesses.