Bug 2450752 (CVE-2026-4700)

Summary:	CVE-2026-4700 firefox: thunderbird: Mitigation bypass in the Networking: HTTP component
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	gotiwari, jgrulich, jhorak, mvyas, rhel-process-autobot, tpopela, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Mitigation bypass in the Networking: HTTP component	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

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