Bug 2477154 (CVE-2026-44432) - CVE-2026-44432 urllib3: urllib3: Denial of Service due to excessive HTTP response decompression
Summary: CVE-2026-44432 urllib3: urllib3: Denial of Service due to excessive HTTP resp...
Keywords:
Status: NEW
Alias: CVE-2026-44432
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-13 17:01 UTC by OSIDB Bzimport
Modified: 2026-07-18 08:29 UTC (History)
137 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:28285 0 None None None 2026-06-23 16:58:40 UTC
Red Hat Product Errata RHSA-2026:27929 0 None None None 2026-06-22 14:40:25 UTC
Red Hat Product Errata RHSA-2026:28000 0 None None None 2026-06-22 15:52:42 UTC
Red Hat Product Errata RHSA-2026:28157 0 None None None 2026-06-23 10:43:14 UTC
Red Hat Product Errata RHSA-2026:28158 0 None None None 2026-06-23 10:17:29 UTC
Red Hat Product Errata RHSA-2026:28159 0 None None None 2026-06-23 10:39:11 UTC
Red Hat Product Errata RHSA-2026:32992 0 None None None 2026-06-29 12:24:33 UTC
Red Hat Product Errata RHSA-2026:34160 0 None None None 2026-07-01 11:03:24 UTC

Description OSIDB Bzimport 2026-05-13 17:01:24 UTC 
urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.
Comment 4 errata-xmlrpc 2026-06-22 14:40:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:27929 https://access.redhat.com/errata/RHSA-2026:27929
Comment 5 errata-xmlrpc 2026-06-22 15:52:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:28000 https://access.redhat.com/errata/RHSA-2026:28000
Comment 6 errata-xmlrpc 2026-06-23 10:17:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:28158 https://access.redhat.com/errata/RHSA-2026:28158
Comment 7 errata-xmlrpc 2026-06-23 10:39:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:28159 https://access.redhat.com/errata/RHSA-2026:28159
Comment 8 errata-xmlrpc 2026-06-23 10:43:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:28157 https://access.redhat.com/errata/RHSA-2026:28157
Comment 9 errata-xmlrpc 2026-06-29 12:24:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:32992 https://access.redhat.com/errata/RHSA-2026:32992
Comment 10 errata-xmlrpc 2026-07-01 11:03:17 UTC 
This issue has been addressed in the following products:

  Red Hat Ansible Automation Platform 2.6 for RHEL 9

Via RHSA-2026:34160 https://access.redhat.com/errata/RHSA-2026:34160
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