AlmaLinux alert ALSA-2026:1226 (python3.12-urllib3)

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[Announce] [Security Advisory] ALSA-2026:1226: python3.12-urllib3 security update (Important)
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Tue, 27 Jan 2026 12:03:09 +0000
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<0100019bff5613b5-3c39b5e7-bd26-49c1-bee4-4b242b1fdf85-000000@email.amazonses.com>
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Article
Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata
notifications from AlmaLinux.

AlmaLinux: 8
Type: Security
Severity: Important
Release date: 2026-01-27

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):  

  * urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion (CVE-2025-66418)
  * urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)
  * urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP
redirects (streaming API) (CVE-2026-21441)


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.


Full details, updated packages, references, and other related information:
https://errata.almalinux.org/8/ALSA-2026-1226.html

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AlmaLinux Team
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