Bug 2450752 (CVE-2026-4700) - CVE-2026-4700 firefox: thunderbird: Mitigation bypass in the Networking: HTTP component
Summary: CVE-2026-4700 firefox: thunderbird: Mitigation bypass in the Networking: HTTP...
Keywords:
Status: NEW
Alias: CVE-2026-4700
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:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-24 13:03 UTC by OSIDB Bzimport
Modified: 2026-04-28 06:59 UTC (History)
7 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 RHSA-2026:5930 0 None None None 2026-03-26 11:32:22 UTC
Red Hat Product Errata RHSA-2026:5931 0 None None None 2026-03-26 11:21:13 UTC
Red Hat Product Errata RHSA-2026:5932 0 None None None 2026-03-26 11:32:30 UTC
Red Hat Product Errata RHSA-2026:6188 0 None None None 2026-03-30 15:59:17 UTC
Red Hat Product Errata RHSA-2026:6342 0 None None None 2026-04-01 09:37:21 UTC
Red Hat Product Errata RHSA-2026:6917 0 None None None 2026-04-07 21:30:14 UTC
Red Hat Product Errata RHSA-2026:7837 0 None None None 2026-04-13 10:51:19 UTC
Red Hat Product Errata RHSA-2026:7838 0 None None None 2026-04-13 10:34:20 UTC
Red Hat Product Errata RHSA-2026:7839 0 None None None 2026-04-13 10:02:48 UTC
Red Hat Product Errata RHSA-2026:7840 0 None None None 2026-04-13 10:02:58 UTC
Red Hat Product Errata RHSA-2026:7841 0 None None None 2026-04-13 10:12:48 UTC
Red Hat Product Errata RHSA-2026:7842 0 None None None 2026-04-13 10:13:13 UTC
Red Hat Product Errata RHSA-2026:7843 0 None None None 2026-04-13 10:21:12 UTC
Red Hat Product Errata RHSA-2026:7845 0 None None None 2026-04-13 10:44:44 UTC
Red Hat Product Errata RHSA-2026:7858 0 None None None 2026-04-13 12:46:05 UTC
Red Hat Product Errata RHSA-2026:8284 0 None None None 2026-04-15 10:47:10 UTC
Red Hat Product Errata RHSA-2026:8285 0 None None None 2026-04-15 10:30:12 UTC
Red Hat Product Errata RHSA-2026:8286 0 None None None 2026-04-15 10:44:27 UTC
Red Hat Product Errata RHSA-2026:8287 0 None None None 2026-04-15 10:38:35 UTC
Red Hat Product Errata RHSA-2026:8288 0 None None None 2026-04-15 10:39:13 UTC
Red Hat Product Errata RHSA-2026:8289 0 None None None 2026-04-15 10:44:47 UTC
Red Hat Product Errata RHSA-2026:8290 0 None None None 2026-04-15 10:50:30 UTC
Red Hat Product Errata RHSA-2026:8315 0 None None None 2026-04-15 14:04:55 UTC
Red Hat Product Errata RHSA-2026:8427 0 None None None 2026-04-16 10:16:25 UTC
Red Hat Product Errata RHSA-2026:8850 0 None None None 2026-04-20 01:27:02 UTC

Description OSIDB Bzimport 2026-03-24 13:03:56 UTC 
Mitigation bypass in the Networking: HTTP component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.
Comment 1 errata-xmlrpc 2026-03-26 11:21:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:5931 https://access.redhat.com/errata/RHSA-2026:5931
Comment 2 errata-xmlrpc 2026-03-26 11:32:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:5930 https://access.redhat.com/errata/RHSA-2026:5930
Comment 3 errata-xmlrpc 2026-03-26 11:32:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:5932 https://access.redhat.com/errata/RHSA-2026:5932
Comment 4 errata-xmlrpc 2026-03-30 15:59:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:6188 https://access.redhat.com/errata/RHSA-2026:6188
Comment 5 errata-xmlrpc 2026-04-01 09:37:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:6342 https://access.redhat.com/errata/RHSA-2026:6342
Comment 6 errata-xmlrpc 2026-04-07 21:30:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:6917 https://access.redhat.com/errata/RHSA-2026:6917
Comment 7 errata-xmlrpc 2026-04-13 10:02:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:7839 https://access.redhat.com/errata/RHSA-2026:7839
Comment 8 errata-xmlrpc 2026-04-13 10:02:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:7840 https://access.redhat.com/errata/RHSA-2026:7840
Comment 9 errata-xmlrpc 2026-04-13 10:12:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:7841 https://access.redhat.com/errata/RHSA-2026:7841
Comment 10 errata-xmlrpc 2026-04-13 10:13:11 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-2026:7842 https://access.redhat.com/errata/RHSA-2026:7842
Comment 11 errata-xmlrpc 2026-04-13 10:21:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:7843 https://access.redhat.com/errata/RHSA-2026:7843
Comment 12 errata-xmlrpc 2026-04-13 10:34:18 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-2026:7838 https://access.redhat.com/errata/RHSA-2026:7838
Comment 13 errata-xmlrpc 2026-04-13 10:44:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:7845 https://access.redhat.com/errata/RHSA-2026:7845
Comment 14 errata-xmlrpc 2026-04-13 10:51:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:7837 https://access.redhat.com/errata/RHSA-2026:7837
Comment 15 errata-xmlrpc 2026-04-13 12:46:03 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-2026:7858 https://access.redhat.com/errata/RHSA-2026:7858
Comment 16 errata-xmlrpc 2026-04-15 10:30:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2026:8285 https://access.redhat.com/errata/RHSA-2026:8285
Comment 17 errata-xmlrpc 2026-04-15 10:38:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:8287 https://access.redhat.com/errata/RHSA-2026:8287
Comment 18 errata-xmlrpc 2026-04-15 10:39:11 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-2026:8288 https://access.redhat.com/errata/RHSA-2026:8288
Comment 19 errata-xmlrpc 2026-04-15 10:44:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:8286 https://access.redhat.com/errata/RHSA-2026:8286
Comment 20 errata-xmlrpc 2026-04-15 10:44:45 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-2026:8289 https://access.redhat.com/errata/RHSA-2026:8289
Comment 21 errata-xmlrpc 2026-04-15 10:47:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:8284 https://access.redhat.com/errata/RHSA-2026:8284
Comment 22 errata-xmlrpc 2026-04-15 10:50:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:8290 https://access.redhat.com/errata/RHSA-2026:8290
Comment 23 errata-xmlrpc 2026-04-15 14:04:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:8315 https://access.redhat.com/errata/RHSA-2026:8315
Comment 24 errata-xmlrpc 2026-04-16 10:16:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:8427 https://access.redhat.com/errata/RHSA-2026:8427
Comment 25 errata-xmlrpc 2026-04-20 01:27:00 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-2026:8850 https://access.redhat.com/errata/RHSA-2026:8850
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