Bug 2421349 (CVE-2025-14523) - CVE-2025-14523 libsoup: libsoup: Duplicate Host Header Handling Causes Host-Parsing Discrepancy (First- vs Last-Value Wins)
Summary: CVE-2025-14523 libsoup: libsoup: Duplicate Host Header Handling Causes Host-P...
Keywords:
Status: NEW
Alias: CVE-2025-14523
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: 2421351 2421352 2421354 2421355 2421353 2421356
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-12-11 07:35 UTC by OSIDB Bzimport
Modified: 2026-01-29 11:28 UTC (History)
0 users

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 RHSA-2026:0421 0 None None None 2026-01-12 02:10:58 UTC
Red Hat Product Errata RHSA-2026:0422 0 None None None 2026-01-12 02:47:12 UTC
Red Hat Product Errata RHSA-2026:0423 0 None None None 2026-01-12 01:33:22 UTC
Red Hat Product Errata RHSA-2026:0836 0 None None None 2026-01-20 06:13:12 UTC
Red Hat Product Errata RHSA-2026:0867 0 None None None 2026-01-20 15:30:04 UTC
Red Hat Product Errata RHSA-2026:0868 0 None None None 2026-01-20 15:29:04 UTC
Red Hat Product Errata RHSA-2026:0905 0 None None None 2026-01-21 05:13:32 UTC
Red Hat Product Errata RHSA-2026:0906 0 None None None 2026-01-21 05:08:29 UTC
Red Hat Product Errata RHSA-2026:0907 0 None None None 2026-01-21 05:33:07 UTC
Red Hat Product Errata RHSA-2026:0908 0 None None None 2026-01-21 05:34:05 UTC
Red Hat Product Errata RHSA-2026:0909 0 None None None 2026-01-21 05:08:16 UTC
Red Hat Product Errata RHSA-2026:0911 0 None None None 2026-01-21 06:35:55 UTC
Red Hat Product Errata RHSA-2026:0925 0 None None None 2026-01-21 12:50:01 UTC
Red Hat Product Errata RHSA-2026:1509 0 None None None 2026-01-28 19:24:08 UTC
Red Hat Product Errata RHSA-2026:1569 0 None None None 2026-01-29 11:28:04 UTC
Red Hat Product Errata RHSA-2026:1570 0 None None None 2026-01-29 11:28:08 UTC
Red Hat Product Errata RHSA-2026:1571 0 None None None 2026-01-29 11:18:00 UTC
Red Hat Product Errata RHSA-2026:1572 0 None None None 2026-01-29 11:18:47 UTC

Description OSIDB Bzimport 2025-12-11 07:35:16 UTC 
libsoup accepts duplicate Host: headers and implements a last-value-wins policy when soup_message_headers_get_one[_common] is used to construct the request URI, while many proxies and routers use the first Host: header for routing. The provided PoC reliably demonstrates that a proxy honoring the first Host: can route to backend A but the libsoup server will interpret the request as for host B (last header), enabling virtual-host confusion and potential bypasses of host-based ACLs or cache poisoning.
Comment 1 errata-xmlrpc 2026-01-12 01:33:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:0423 https://access.redhat.com/errata/RHSA-2026:0423
Comment 2 errata-xmlrpc 2026-01-12 02:10:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:0421 https://access.redhat.com/errata/RHSA-2026:0421
Comment 3 errata-xmlrpc 2026-01-12 02:47:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:0422 https://access.redhat.com/errata/RHSA-2026:0422
Comment 4 errata-xmlrpc 2026-01-20 06:13:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:0836 https://access.redhat.com/errata/RHSA-2026:0836
Comment 5 errata-xmlrpc 2026-01-20 15:29:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:0868 https://access.redhat.com/errata/RHSA-2026:0868
Comment 6 errata-xmlrpc 2026-01-20 15:30:03 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-2026:0867 https://access.redhat.com/errata/RHSA-2026:0867
Comment 7 errata-xmlrpc 2026-01-21 05:08:15 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-2026:0909 https://access.redhat.com/errata/RHSA-2026:0909
Comment 8 errata-xmlrpc 2026-01-21 05:08:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:0906 https://access.redhat.com/errata/RHSA-2026:0906
Comment 9 errata-xmlrpc 2026-01-21 05:13:31 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-2026:0905 https://access.redhat.com/errata/RHSA-2026:0905
Comment 10 errata-xmlrpc 2026-01-21 05:33:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:0907 https://access.redhat.com/errata/RHSA-2026:0907
Comment 11 errata-xmlrpc 2026-01-21 05:34:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:0908 https://access.redhat.com/errata/RHSA-2026:0908
Comment 12 errata-xmlrpc 2026-01-21 06:35:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:0911 https://access.redhat.com/errata/RHSA-2026:0911
Comment 13 errata-xmlrpc 2026-01-21 12:50:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:0925 https://access.redhat.com/errata/RHSA-2026:0925
Comment 14 errata-xmlrpc 2026-01-28 19:24:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:1509 https://access.redhat.com/errata/RHSA-2026:1509
Comment 15 errata-xmlrpc 2026-01-29 11:17:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:1571 https://access.redhat.com/errata/RHSA-2026:1571
Comment 16 errata-xmlrpc 2026-01-29 11:18:46 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-2026:1572 https://access.redhat.com/errata/RHSA-2026:1572
Comment 17 errata-xmlrpc 2026-01-29 11:28:03 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-2026:1569 https://access.redhat.com/errata/RHSA-2026:1569
Comment 18 errata-xmlrpc 2026-01-29 11:28:07 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-2026:1570 https://access.redhat.com/errata/RHSA-2026:1570
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