Bug 2419455 (CVE-2025-66418) - CVE-2025-66418 urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion
Summary: CVE-2025-66418 urllib3: urllib3: Unbounded decompression chain leads to resou...
Keywords:
Status: NEW
Alias: CVE-2025-66418
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2422212 2422213 2431356 2431357 2431358 2422507 2422508 2422509 2422510 2422511 2422512 2422513 2422514 2422515 2422591 2431355 2431359
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-12-05 17:01 UTC by OSIDB Bzimport
Modified: 2026-01-28 11:22 UTC (History)
166 users (show)

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

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:1301 0 None None None 2026-01-26 23:37:43 UTC
Red Hat Product Errata RHSA-2026:1086 0 None None None 2026-01-26 12:38:27 UTC
Red Hat Product Errata RHSA-2026:1087 0 None None None 2026-01-26 12:59:45 UTC
Red Hat Product Errata RHSA-2026:1088 0 None None None 2026-01-26 14:14:57 UTC
Red Hat Product Errata RHSA-2026:1089 0 None None None 2026-01-26 14:06:37 UTC
Red Hat Product Errata RHSA-2026:1224 0 None None None 2026-01-26 14:58:11 UTC
Red Hat Product Errata RHSA-2026:1226 0 None None None 2026-01-26 15:29:45 UTC
Red Hat Product Errata RHSA-2026:1239 0 None None None 2026-01-26 17:59:26 UTC
Red Hat Product Errata RHSA-2026:1240 0 None None None 2026-01-26 18:14:11 UTC
Red Hat Product Errata RHSA-2026:1241 0 None None None 2026-01-26 17:55:09 UTC
Red Hat Product Errata RHSA-2026:1254 0 None None None 2026-01-26 20:44:31 UTC
Red Hat Product Errata RHSA-2026:1329 0 None None None 2026-01-27 08:31:21 UTC
Red Hat Product Errata RHSA-2026:1330 0 None None None 2026-01-27 08:28:28 UTC
Red Hat Product Errata RHSA-2026:1331 0 None None None 2026-01-27 08:48:59 UTC
Red Hat Product Errata RHSA-2026:1332 0 None None None 2026-01-27 08:59:43 UTC
Red Hat Product Errata RHSA-2026:1336 0 None None None 2026-01-27 09:30:24 UTC
Red Hat Product Errata RHSA-2026:1337 0 None None None 2026-01-27 09:30:11 UTC
Red Hat Product Errata RHSA-2026:1338 0 None None None 2026-01-27 09:49:35 UTC
Red Hat Product Errata RHSA-2026:1339 0 None None None 2026-01-27 09:31:32 UTC
Red Hat Product Errata RHSA-2026:1340 0 None None None 2026-01-27 09:31:20 UTC
Red Hat Product Errata RHSA-2026:1485 0 None None None 2026-01-28 11:22:00 UTC

Description OSIDB Bzimport 2025-12-05 17:01:44 UTC 
urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data. This vulnerability is fixed in 2.6.0.
Comment 2 errata-xmlrpc 2026-01-26 12:38:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:1086 https://access.redhat.com/errata/RHSA-2026:1086
Comment 3 errata-xmlrpc 2026-01-26 12:59:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:1087 https://access.redhat.com/errata/RHSA-2026:1087
Comment 4 errata-xmlrpc 2026-01-26 14:06:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:1089 https://access.redhat.com/errata/RHSA-2026:1089
Comment 5 errata-xmlrpc 2026-01-26 14:14:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:1088 https://access.redhat.com/errata/RHSA-2026:1088
Comment 6 errata-xmlrpc 2026-01-26 14:57:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:1224 https://access.redhat.com/errata/RHSA-2026:1224
Comment 7 errata-xmlrpc 2026-01-26 15:29:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:1226 https://access.redhat.com/errata/RHSA-2026:1226
Comment 8 errata-xmlrpc 2026-01-26 17:54:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:1241 https://access.redhat.com/errata/RHSA-2026:1241
Comment 9 errata-xmlrpc 2026-01-26 17:59:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:1239 https://access.redhat.com/errata/RHSA-2026:1239
Comment 10 errata-xmlrpc 2026-01-26 18:13:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:1240 https://access.redhat.com/errata/RHSA-2026:1240
Comment 11 errata-xmlrpc 2026-01-26 20:44:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:1254 https://access.redhat.com/errata/RHSA-2026:1254
Comment 12 errata-xmlrpc 2026-01-27 08:28:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:1330 https://access.redhat.com/errata/RHSA-2026:1330
Comment 13 errata-xmlrpc 2026-01-27 08:31:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:1329 https://access.redhat.com/errata/RHSA-2026:1329
Comment 14 errata-xmlrpc 2026-01-27 08:48:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:1331 https://access.redhat.com/errata/RHSA-2026:1331
Comment 15 errata-xmlrpc 2026-01-27 08:59:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:1332 https://access.redhat.com/errata/RHSA-2026:1332
Comment 16 errata-xmlrpc 2026-01-27 09:30:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:1337 https://access.redhat.com/errata/RHSA-2026:1337
Comment 17 errata-xmlrpc 2026-01-27 09:30:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:1336 https://access.redhat.com/errata/RHSA-2026:1336
Comment 18 errata-xmlrpc 2026-01-27 09:31:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2026:1340 https://access.redhat.com/errata/RHSA-2026:1340
Comment 19 errata-xmlrpc 2026-01-27 09:31:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:1339 https://access.redhat.com/errata/RHSA-2026:1339
Comment 20 errata-xmlrpc 2026-01-27 09:49:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:1338 https://access.redhat.com/errata/RHSA-2026:1338
Comment 21 errata-xmlrpc 2026-01-28 11:21:49 UTC 
This issue has been addressed in the following products:

  RHUI 4 for RHEL 8

Via RHSA-2026:1485 https://access.redhat.com/errata/RHSA-2026:1485
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