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):
* python: Python: Command-line option injection in webbrowser.open() via crafted URLs (CVE-2026-4519)
* 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)
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 7
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | python3.11 | 3.11.13-9.el9_8 |
| AlmaLinux · 9 | python3.11-debug | 3.11.13-9.el9_8 |
| AlmaLinux · 9 | python3.11-devel | 3.11.13-9.el9_8 |
| AlmaLinux · 9 | python3.11-idle | 3.11.13-9.el9_8 |
| AlmaLinux · 9 | python3.11-libs | 3.11.13-9.el9_8 |
| AlmaLinux · 9 | python3.11-test | 3.11.13-9.el9_8 |
| AlmaLinux · 9 | python3.11-tkinter | 3.11.13-9.el9_8 |
Vulnerabilities 3
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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.
References
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report
https://access.redhat.com/security/cve/CVE-2026-4519
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report
https://access.redhat.com/security/cve/CVE-2026-4786
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report
https://access.redhat.com/security/cve/CVE-2026-6100
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report
https://bugzilla.redhat.com/2449649
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report
https://bugzilla.redhat.com/2457932
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report
https://bugzilla.redhat.com/2458049
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advisory
https://errata.almalinux.org/9/ALSA-2026-19175.html