Bug 2506217 (CVE-2026-14899) - CVE-2026-14899 thunderbird: Off-by-one out of bounds read in MIME header parser for forwarding
Summary: CVE-2026-14899 thunderbird: Off-by-one out of bounds read in MIME header pars...
Keywords:
Status: NEW
Alias: CVE-2026-14899
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-22 20:01 UTC by OSIDB Bzimport
Modified: 2026-08-11 14:29 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-2026:49621 0 None None None 2026-08-03 10:24:05 UTC
Red Hat Product Errata RHSA-2026:49921 0 None None None 2026-08-04 08:59:40 UTC
Red Hat Product Errata RHSA-2026:49922 0 None None None 2026-08-04 08:43:48 UTC
Red Hat Product Errata RHSA-2026:53444 0 None None None 2026-08-11 13:44:57 UTC
Red Hat Product Errata RHSA-2026:53445 0 None None None 2026-08-11 13:03:33 UTC
Red Hat Product Errata RHSA-2026:53446 0 None None None 2026-08-11 13:45:20 UTC
Red Hat Product Errata RHSA-2026:53453 0 None None None 2026-08-11 14:22:08 UTC
Red Hat Product Errata RHSA-2026:53454 0 None None None 2026-08-11 14:22:14 UTC
Red Hat Product Errata RHSA-2026:53455 0 None None None 2026-08-11 13:59:02 UTC
Red Hat Product Errata RHSA-2026:53475 0 None None None 2026-08-11 14:29:50 UTC

Description OSIDB Bzimport 2026-07-22 20:01:45 UTC 
The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13.
Comment 1 errata-xmlrpc 2026-08-03 10:24:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:49621 https://access.redhat.com/errata/RHSA-2026:49621
Comment 2 errata-xmlrpc 2026-08-04 08:43:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:49922 https://access.redhat.com/errata/RHSA-2026:49922
Comment 3 errata-xmlrpc 2026-08-04 08:59:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:49921 https://access.redhat.com/errata/RHSA-2026:49921
Comment 4 errata-xmlrpc 2026-08-11 13:03:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:53445 https://access.redhat.com/errata/RHSA-2026:53445
Comment 5 errata-xmlrpc 2026-08-11 13:44:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:53444 https://access.redhat.com/errata/RHSA-2026:53444
Comment 6 errata-xmlrpc 2026-08-11 13:45:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:53446 https://access.redhat.com/errata/RHSA-2026:53446
Comment 7 errata-xmlrpc 2026-08-11 13:59:01 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-2026:53455 https://access.redhat.com/errata/RHSA-2026:53455
Comment 8 errata-xmlrpc 2026-08-11 14:22:06 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 Extended Update Support Long-Life Add-On

Via RHSA-2026:53453 https://access.redhat.com/errata/RHSA-2026:53453
Comment 9 errata-xmlrpc 2026-08-11 14:22:12 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-2026:53454 https://access.redhat.com/errata/RHSA-2026:53454
Comment 10 errata-xmlrpc 2026-08-11 14:29:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:53475 https://access.redhat.com/errata/RHSA-2026:53475
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