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59 vulnerabilities found for by Python Software Foundation

CVE-2026-9669 (GCVE-0-2026-9669)
Vulnerability from cvelistv5
Published
2026-06-08 22:01
Modified
2026-06-08 23:27
CWE
  • CWE-121 - Stack-based buffer overflow
Summary
bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash the process when processing untrusted data.
Impacted products
Show details on NVD website


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CVE-2026-7774 (GCVE-0-2026-7774)
Vulnerability from cvelistv5
Published
2026-06-04 14:21
Modified
2026-06-04 18:45
CWE
Summary
tarfile.data_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() to write files outside the destination directory, subject to the permissions of the extracting process.
Impacted products
Show details on NVD website


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CVE-2026-3276 (GCVE-0-2026-3276)
Vulnerability from cvelistv5
Published
2026-06-03 14:29
Modified
2026-06-04 17:03
CWE
Summary
unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating Canonical Combining Class values. This affects all normalization forms.
Impacted products
Show details on NVD website


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CVE-2026-8328 (GCVE-0-2026-8328)
Vulnerability from cvelistv5
Published
2026-05-13 20:14
Modified
2026-05-14 12:49
CWE
  • CWE-918 - Server-Side request forgery (SSRF)
Summary
The ftpcp() function in Lib/ftplib.py was not updated when CVE-2021-4189 was fixed. While makepasv() was patched to replace server-supplied PASV host addresses with the actual peer address (getpeername()[0]), ftpcp() still calls parse227() directly and passes the raw attacker-controllable IP address and port to target.sendport(). This patch is related to CVE-2021-4189.
Impacted products
Show details on NVD website


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CVE-2026-7210 (GCVE-0-2026-7210)
Vulnerability from cvelistv5
Published
2026-05-11 17:19
Modified
2026-05-11 20:34
CWE
Summary
`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.
Impacted products
Show details on NVD website


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CVE-2026-3087 (GCVE-0-2026-3087)
Vulnerability from cvelistv5
Published
2026-04-27 20:46
Modified
2026-06-04 14:08
CWE
Summary
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.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2026-6019 (GCVE-0-2026-6019)
Vulnerability from cvelistv5
Published
2026-04-22 19:28
Modified
2026-04-29 15:31
CWE
  • CWE-150 - Improper neutralization of escape, meta, or control sequences
Summary
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.
Impacted products
Show details on NVD website


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CVE-2026-3298 (GCVE-0-2026-3298)
Vulnerability from cvelistv5
Published
2026-04-21 14:45
Modified
2026-05-12 13:25
CWE
Summary
The method "sock_recvfrom_into()" of "asyncio.ProacterEventLoop" (Windows only) was missing a boundary check for the data buffer when using nbytes parameter. This allowed for an out-of-bounds buffer write if data was larger than the buffer size. Non-Windows platforms are not affected.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 3.11.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2026-5713 (GCVE-0-2026-5713)
Vulnerability from cvelistv5
Published
2026-04-14 15:11
Modified
2026-04-15 17:24
CWE
Summary
The "profiling.sampling" module (Python 3.15+) and "asyncio introspection capabilities" (3.14+, "python -m asyncio ps" and "python -m asyncio pstree") features could be used to read and write addresses in a privileged process if that process connected to a malicious or "infected" Python process via the remote debugging feature. This vulnerability requires persistently and repeatedly connecting to the process to be exploited, even after the connecting process crashes with high likelihood due to ASLR.
Impacted products
Show details on NVD website


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CVE-2026-4786 (GCVE-0-2026-4786)
Vulnerability from cvelistv5
Published
2026-04-13 21:52
Modified
2026-04-29 15:30
CWE
Summary
Mitgation of CVE-2026-4519 was incomplete. If the URL contained "%action" the mitigation could be bypassed for certain browser types the "webbrowser.open()" API could have commands injected into the underlying shell. See CVE-2026-4519 for details.
Impacted products
Show details on NVD website


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CVE-2026-6100 (GCVE-0-2026-6100)
Vulnerability from cvelistv5
Published
2026-04-13 17:15
Modified
2026-04-14 14:30
CWE
Summary
Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a memory allocation fails with a `MemoryError` and the decompression instance is re-used. This scenario can be triggered if the process is under memory pressure. The fix cleans up the dangling pointer in this specific error condition. The vulnerability is only present if the program re-uses decompressor instances across multiple decompression calls even after a `MemoryError` is raised during decompression. Using the helper functions to one-shot decompress data such as `lzma.decompress()`, `bz2.decompress()`, `gzip.decompress()`, and `zlib.decompress()` are not affected as a new decompressor instance is used per call. If the decompressor instance is not re-used after an error condition, this usage is similarly not vulnerable.
Impacted products
Show details on NVD website


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CVE-2026-3446 (GCVE-0-2026-3446)
Vulnerability from cvelistv5
Published
2026-04-10 18:17
Modified
2026-04-13 16:07
Summary
When calling base64.b64decode() or related functions the decoding process would stop after encountering the first padded quad regardless of whether there was more information to be processed. This can lead to data being accepted which may be processed differently by other implementations. Use "validate=True" to enable stricter processing of base64 data.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2026-1502 (GCVE-0-2026-1502)
Vulnerability from cvelistv5
Published
2026-04-10 17:54
Modified
2026-06-04 14:08
Summary
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2026-5271 (GCVE-0-2026-5271)
Vulnerability from cvelistv5
Published
2026-04-01 13:48
Modified
2026-04-01 23:12
Summary
pymanager included the current working directory in sys.path meaning modules could be shadowed by modules in the current working directory. As a result, if a user executes a pymanager-generated command (e.g., pip, pytest) from an attacker-controlled directory, a malicious module in that directory can be imported and executed instead of the intended package.
Impacted products
Show details on NVD website


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CVE-2026-4519 (GCVE-0-2026-4519)
Vulnerability from cvelistv5
Published
2026-03-20 15:08
Modified
2026-04-13 21:47
Summary
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().
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2026-3479 (GCVE-0-2026-3479)
Vulnerability from cvelistv5
Published
2026-03-18 18:13
Modified
2026-04-07 22:01
Summary
DISPUTED: The project has clarified that the documentation was incorrect, and that pkgutil.get_data() has the same security model as open(). The documentation has been updated to clarify this point. There is no vulnerability in the function if following the intended security model. pkgutil.get_data() did not validate the resource argument as documented, allowing path traversals.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2026-4224 (GCVE-0-2026-4224)
Vulnerability from cvelistv5
Published
2026-03-16 17:52
Modified
2026-04-08 12:55
Summary
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.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2026-3644 (GCVE-0-2026-3644)
Vulnerability from cvelistv5
Published
2026-03-16 17:37
Modified
2026-04-07 22:01
Summary
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().
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2025-13462 (GCVE-0-2025-13462)
Vulnerability from cvelistv5
Published
2026-03-12 17:59
Modified
2026-06-04 14:02
Summary
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.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.14.0
Version: 3.15.0a1
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Show details on NVD website


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CVE-2026-2297 (GCVE-0-2026-2297)
Vulnerability from cvelistv5
Published
2026-03-04 22:10
Modified
2026-05-01 15:13
Summary
The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2026-1299 (GCVE-0-2026-1299)
Vulnerability from cvelistv5
Published
2026-01-23 16:27
Modified
2026-03-03 14:43
CWE
Summary
The email module, specifically the "BytesGenerator" class, didn’t properly quote newlines for email headers when serializing an email message allowing for header injection when an email is serialized. This is only applicable if using "LiteralHeader" writing headers that don't respect email folding rules, the new behavior will reject the incorrectly folded headers in "BytesGenerator".
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.11.0
Version: 3.12.0
Version: 3.13.0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2025-12781 (GCVE-0-2025-12781)
Vulnerability from cvelistv5
Published
2026-01-21 19:34
Modified
2026-01-22 20:12
Summary
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.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2026-0672 (GCVE-0-2026-0672)
Vulnerability from cvelistv5
Published
2026-01-20 21:52
Modified
2026-03-03 14:43
CWE
Summary
When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP headers into messages. Patch rejects all control characters within cookie names, values, and parameters.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.11.0
Version: 3.12.0
Version: 3.13.0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2025-15367 (GCVE-0-2025-15367)
Vulnerability from cvelistv5
Published
2026-01-20 21:47
Modified
2026-02-26 14:44
CWE
  • CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Summary
The poplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters.
Impacted products
Show details on NVD website


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CVE-2025-15366 (GCVE-0-2025-15366)
Vulnerability from cvelistv5
Published
2026-01-20 21:40
Modified
2026-02-26 14:44
CWE
  • CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Summary
The imaplib module, when passed a user-controlled command, can have additional commands injected using newlines. Mitigation rejects commands containing control characters.
Impacted products
Show details on NVD website


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CVE-2025-15282 (GCVE-0-2025-15282)
Vulnerability from cvelistv5
Published
2026-01-20 21:35
Modified
2026-03-03 14:42
CWE
Summary
User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.11.0
Version: 3.12.0
Version: 3.13.0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2026-0865 (GCVE-0-2026-0865)
Vulnerability from cvelistv5
Published
2026-01-20 21:26
Modified
2026-03-03 14:43
CWE
  • CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Summary
User-controlled header names and values containing newlines can allow injecting HTTP headers.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.11.0
Version: 3.12.0
Version: 3.13.0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2025-11468 (GCVE-0-2025-11468)
Vulnerability from cvelistv5
Published
2026-01-20 21:09
Modified
2026-03-03 14:41
Summary
When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.11.0
Version: 3.12.0
Version: 3.13.0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2025-12084 (GCVE-0-2025-12084)
Vulnerability from cvelistv5
Published
2025-12-03 18:55
Modified
2026-03-03 14:41
Summary
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.
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.11.0
Version: 3.12.0
Version: 3.13.0
Version: 3.14.0
Version: 3.15.0a1
Create a notification for this product.
Show details on NVD website


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CVE-2025-13837 (GCVE-0-2025-13837)
Vulnerability from cvelistv5
Published
2025-12-01 18:13
Modified
2026-03-03 14:41
Summary
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
Impacted products
Vendor Product Version
Python Software Foundation CPython Version: 0
Version: 3.11.0
Version: 3.12.0
Version: 3.13.0
Version: 3.14.0
Version: 3.15.0a1
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Show details on NVD website


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