Bug 2372281 (CVE-2025-5986) - CVE-2025-5986 thunderbird: Unsolicited File Download, Disk Space Exhaustion, and Credential Leakage via mailbox:/// Links
Summary: CVE-2025-5986 thunderbird: Unsolicited File Download, Disk Space Exhaustion, ...
Keywords:
Status: NEW
Alias: CVE-2025-5986
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: 2025-06-11 12:47 UTC by OSIDB Bzimport
Modified: 2025-09-01 08:28 UTC (History)
4 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-2025:10159 0 None None None 2025-07-01 21:15:37 UTC
Red Hat Product Errata RHSA-2025:10160 0 None None None 2025-07-01 20:46:34 UTC
Red Hat Product Errata RHSA-2025:10161 0 None None None 2025-07-01 19:45:20 UTC
Red Hat Product Errata RHSA-2025:10163 0 None None None 2025-07-01 20:11:15 UTC
Red Hat Product Errata RHSA-2025:10164 0 None None None 2025-07-01 21:39:44 UTC
Red Hat Product Errata RHSA-2025:10165 0 None None None 2025-07-01 19:48:58 UTC
Red Hat Product Errata RHSA-2025:10166 0 None None None 2025-07-01 19:40:19 UTC
Red Hat Product Errata RHSA-2025:10195 0 None None None 2025-07-02 08:08:36 UTC
Red Hat Product Errata RHSA-2025:10196 0 None None None 2025-07-02 08:19:13 UTC
Red Hat Product Errata RHSA-2025:10246 0 None None None 2025-07-02 14:54:20 UTC

Description OSIDB Bzimport 2025-06-11 12:47:25 UTC 
A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data (e.g. using /dev/urandom on Linux) or to leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content.
Comment 1 errata-xmlrpc 2025-07-01 19:40:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2025:10166 https://access.redhat.com/errata/RHSA-2025:10166
Comment 2 errata-xmlrpc 2025-07-01 19:45:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:10161 https://access.redhat.com/errata/RHSA-2025:10161
Comment 3 errata-xmlrpc 2025-07-01 19:48:57 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Via RHSA-2025:10165 https://access.redhat.com/errata/RHSA-2025:10165
Comment 4 errata-xmlrpc 2025-07-01 20:11:12 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-2025:10163 https://access.redhat.com/errata/RHSA-2025:10163
Comment 5 errata-xmlrpc 2025-07-01 20:46:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2025:10160 https://access.redhat.com/errata/RHSA-2025:10160
Comment 6 errata-xmlrpc 2025-07-01 21:15:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:10159 https://access.redhat.com/errata/RHSA-2025:10159
Comment 7 errata-xmlrpc 2025-07-01 21:39:43 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-2025:10164 https://access.redhat.com/errata/RHSA-2025:10164
Comment 8 errata-xmlrpc 2025-07-02 08:08:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:10195 https://access.redhat.com/errata/RHSA-2025:10195
Comment 9 errata-xmlrpc 2025-07-02 08:19:11 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:10196 https://access.redhat.com/errata/RHSA-2025:10196
Comment 10 errata-xmlrpc 2025-07-02 14:54:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:10246 https://access.redhat.com/errata/RHSA-2025:10246
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