Bug 2517823 (CVE-2026-74987) - CVE-2026-74987 firefox: thunderbird: Internally found bugs fixed in Firefox ESR 140.14, Firefox ESR 153.1 and Firefox 154
Summary: CVE-2026-74987 firefox: thunderbird: Internally found bugs fixed in Firefox E...
Keywords:
Status: NEW
Alias: CVE-2026-74987
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-18 12:47 UTC by OSIDB Bzimport
Modified: 2026-08-24 10:05 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:58897 0 None None None 2026-08-24 10:05:53 UTC
Red Hat Product Errata RHSA-2026:58898 0 None None None 2026-08-24 09:36:09 UTC
Red Hat Product Errata RHSA-2026:58899 0 None None None 2026-08-24 09:34:58 UTC

Description OSIDB Bzimport 2026-08-18 12:47:14 UTC 
Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, and Firefox ESR 153.1.
Comment 1 errata-xmlrpc 2026-08-24 09:34:57 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 09:36:08 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 10:05:52 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
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