Bug 2517837 (CVE-2026-74949) - CVE-2026-74949 firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component
Summary: CVE-2026-74949 firefox: thunderbird: Privilege escalation due to use-after-fr...
Keywords:
Status: NEW
Alias: CVE-2026-74949
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: 2026-08-18 12:50 UTC by OSIDB Bzimport
Modified: 2026-08-24 10:06 UTC (History)
5 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-2026:58897 0 None None None 2026-08-24 10:06:01 UTC
Red Hat Product Errata RHSA-2026:58898 0 None None None 2026-08-24 09:36:18 UTC
Red Hat Product Errata RHSA-2026:58899 0 None None None 2026-08-24 09:35:26 UTC

Description OSIDB Bzimport 2026-08-18 12:50:11 UTC 
Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.
Comment 1 errata-xmlrpc 2026-08-24 09:35:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:58899 https://access.redhat.com/errata/RHSA-2026:58899
Comment 2 errata-xmlrpc 2026-08-24 09:36:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:58898 https://access.redhat.com/errata/RHSA-2026:58898
Comment 3 errata-xmlrpc 2026-08-24 10:06:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:58897 https://access.redhat.com/errata/RHSA-2026:58897
Note You need to log in before you can comment on or make changes to this bug.