Vulnerabilities (CVE)

Filtered by vendor Python Subscribe
Filtered by product Python
Total 144 CVE
CVE Vendors Products Updated CVSS v2 CVSS v3
CVE-2026-15308 1 Python 1 Python 2026-08-11 N/A 7.5 HIGH
The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.
CVE-2026-3087 2 Microsoft, Python 2 Windows, Python 2026-08-10 N/A 7.5 HIGH
If `shutil.unpack_archive()` is given a ZIP archive with an absolute Windows path containing a drive (`C:\\...`) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability.
CVE-2026-4360 1 Python 1 Python 2026-08-06 N/A 5.3 MEDIUM
In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An affected system that extracts content from untrusted tar files could end up writing files with an unexpected uid/gid despite the user passing filter='data' to the extract() function.
CVE-2026-4224 1 Python 1 Python 2026-08-05 N/A 7.5 HIGH
When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.
CVE-2026-3644 1 Python 1 Python 2026-08-05 N/A 7.5 HIGH
The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().
CVE-2023-6507 1 Python 1 Python 2026-07-31 N/A 6.1 MEDIUM
An issue was found in CPython 3.12.0 `subprocess` module on POSIX platforms. The issue was fixed in CPython 3.12.1 and does not affect other stable releases. When using the `extra_groups=` parameter with an empty list as a value (ie `extra_groups=[]`) the logic regressed to not call `setgroups(0, NULL)` before calling `exec()`, thus not dropping the original processes' groups before starting the new process. There is no issue when the parameter isn't used or when any value is used besides an empty list. This issue only impacts CPython processes run with sufficient privilege to make the `setgroups` system call (typically `root`).
CVE-2025-6075 1 Python 1 Python 2026-07-31 N/A 5.5 MEDIUM
If the value passed to os.path.expandvars() is user-controlled a performance degradation is possible when expanding environment variables.
CVE-2026-7210 1 Python 1 Python 2026-07-27 N/A 7.5 HIGH
`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.
CVE-2026-6019 1 Python 1 Python 2026-07-27 N/A 6.1 MEDIUM
http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence </script> inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.
CVE-2009-3720 3 Apache, Libexpat Project, Python 4 Http Server, Libexpat, Python and 1 more 2026-07-20 5.0 MEDIUM N/A
The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625.
CVE-2026-4519 1 Python 1 Python 2026-07-15 N/A 3.3 LOW
The webbrowser.open() API would accept leading dashes in the URL which could be handled as command line options for certain web browsers. New behavior rejects leading dashes. Users are recommended to sanitize URLs prior to passing to webbrowser.open().
CVE-2018-25032 12 Apple, Azul, Debian and 9 more 39 Mac Os X, Macos, Zulu and 36 more 2026-07-14 5.0 MEDIUM 7.5 HIGH
zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if the input has many distant matches.
CVE-2025-13837 1 Python 1 Python 2026-06-17 N/A 5.5 MEDIUM
When loading a plist file, the plistlib module reads data in size specified by the file itself, meaning a malicious file can cause OOM and DoS issues
CVE-2025-13836 1 Python 1 Python 2026-06-17 N/A 7.5 HIGH
When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.
CVE-2025-13462 1 Python 1 Python 2026-06-17 N/A 3.3 LOW
The "tarfile" module would still apply normalization of AREGTYPE (\x00) blocks to DIRTYPE, even while processing a multi-block member such as GNUTYPE_LONGNAME or GNUTYPE_LONGLINK. This could result in a crafted tar archive being misinterpreted by the tarfile module compared to other implementations.
CVE-2025-12781 1 Python 1 Python 2026-06-17 N/A 5.3 MEDIUM
When passing data to the b64decode(), standard_b64decode(), and urlsafe_b64decode() functions in the "base64" module the characters "+/" will always be accepted, regardless of the value of "altchars" parameter, typically used to establish an "alternative base64 alphabet" such as the URL safe alphabet. This behavior matches what is recommended in earlier base64 RFCs, but newer RFCs now recommend either dropping characters outside the specified base64 alphabet or raising an error. The old behavior has the possibility of causing data integrity issues. This behavior can only be insecure if your application uses an alternate base64 alphabet (without "+/"). If your application does not use the "altchars" parameter or the urlsafe_b64decode() function, then your application does not use an alternative base64 alphabet. The attached patches DOES NOT make the base64-decode behavior raise an error, as this would be a change in behavior and break existing programs. Instead, the patch deprecates the behavior which will be replaced with the newly recommended behavior in a future version of Python. Users are recommended to mitigate by verifying user-controlled inputs match the base64 alphabet they are expecting or verify that their application would not be affected if the b64decode() functions accepted "+" or "/" outside of altchars.
CVE-2025-12084 1 Python 1 Python 2026-06-17 N/A 5.3 MEDIUM
When building nested elements using xml.dom.minidom methods such as appendChild() that have a dependency on _clear_id_cache() the algorithm is quadratic. Availability can be impacted when building excessively nested documents.
CVE-2024-9287 1 Python 1 Python 2026-06-17 N/A 7.8 HIGH
A vulnerability has been found in the CPython `venv` module and CLI where path names provided when creating a virtual environment were not quoted properly, allowing the creator to inject commands into virtual environment "activation" scripts (ie "source venv/bin/activate"). This means that attacker-controlled virtual environments are able to run commands when the virtual environment is activated. Virtual environments which are not created by an attacker or which aren't activated before being used (ie "./venv/bin/python") are not affected.
CVE-2024-7592 1 Python 1 Python 2026-06-17 N/A 7.5 HIGH
There is a LOW severity vulnerability affecting CPython, specifically the 'http.cookies' standard library module. When parsing cookies that contained backslashes for quoted characters in the cookie value, the parser would use an algorithm with quadratic complexity, resulting in excess CPU resources being used while parsing the value.
CVE-2024-6232 1 Python 1 Python 2026-06-17 N/A 7.5 HIGH
There is a MEDIUM severity vulnerability affecting CPython. Regular expressions that allowed excessive backtracking during tarfile.TarFile header parsing are vulnerable to ReDoS via specifically-crafted tar archives.