Summary
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: wsgiref.headers.Headers allows header newline injection in Python (CVE-2026-0865)
* cpython: CPython: Logging Bypass in Legacy .pyc File Handling (CVE-2026-2297)
* cpython: Incomplete control character validation in http.cookies (CVE-2026-3644)
* cpython: Stack overflow parsing XML with deeply nested DTD content models (CVE-2026-4224)
* python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)
* python: Python: HTTP header injection via CR/LF in proxy tunnel headers (CVE-2026-1502)
* python: Python: Arbitrary code execution or information disclosure via use-after-free in decompression modules (CVE-2026-6100)
* python: cpython: Python: Arbitrary code execution via command injection in webbrowser.open() API (CVE-2026-4786)
* python: Python: Information disclosure and arbitrary code execution via remote debugging with a malicious process. (CVE-2026-5713)
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.
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| Rocky Linux · 10 | python3.14 | 0:3.14.4-2.el10_2 |
Vulnerabilities 9
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Critical 9.1
Use-after-free in lzma.LZMADecompressor, bz2.BZ2Decompressor, and gzip.GzipFile after re-use under memory pressure
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 …
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High 7.0
webbrowser.open() allows leading dashes in URLs
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().
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High 7.0
Incomplete mitigation of CVE-2026-4519, %action expansion for command injection to webbrowser.open()
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.
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Medium 6.0
Incomplete control character validation in http.cookies
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_o…
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Medium 6.0
Stack overflow parsing XML with deeply nested DTD content models
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.
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Medium 5.9
wsgiref.headers.Headers allows header newline injection
User-controlled header names and values containing newlines can allow injecting HTTP headers.
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Medium 5.7
HTTP client proxy tunnel headers not validated for CR/LF
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
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Medium 5.7
SourcelessFileLoader does not use io.open_code()
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.
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Medium 5.3
Out-of-bounds read/write during remote profiling and asyncio process introspection when connecting to malicious target
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 ma…
References
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2448181
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2448168
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2449649
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2444691
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2457409
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2458049
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2458239
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2431367
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2457932