Bug 2562035 (CVE-2026-117866) - CVE-2026-117866 firefox: thunderbird: Privilege escalation due to use-after-free in the Graphics: Canvas2D component
Summary: CVE-2026-117866 firefox: thunderbird: Privilege escalation due to use-after-f...
Keywords:
Status: NEW
Alias: CVE-2026-117866
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: 2026-10-27 14:57 UTC by OSIDB Bzimport
Modified: 2026-11-03 07:40 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-2026:93956 0 None None None 2026-11-02 17:00:39 UTC
Red Hat Product Errata RHSA-2026:93957 0 None None None 2026-11-02 18:01:40 UTC
Red Hat Product Errata RHSA-2026:94405 0 None None None 2026-11-03 07:40:36 UTC

Description OSIDB Bzimport 2026-10-27 14:57:21 UTC 
Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.
Comment 1 Jon Orris 2026-11-02 17:00:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:93956 https://access.redhat.com/errata/RHSA-2026:93956
Comment 2 Jon Orris 2026-11-02 18:01:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:93957 https://access.redhat.com/errata/RHSA-2026:93957
Comment 3 Jon Orris 2026-11-03 07:40:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:94405 https://access.redhat.com/errata/RHSA-2026:94405
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