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8.8
Thunderbird and LibreWolf may crash and be exploited
published 4 days ago
Summary
Both Thunderbird email client and LibreWolf browser can experience a crash when a scheduled message task is removed too early. This crash could allow an attacker to run code on the affected system. Update to the latest versions or apply vendor patches to fix the issue.
What to do
- Update cleanstart thunderbird to version 91.3.2-r0.
- Update cleanstart librewolf to version 93.0-r0.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| CleanStart | cleanstart | thunderbird |
< 91.3.2-r0 Fix: upgrade to 91.3.2-r0
|
| CleanStart | cleanstart | librewolf |
< 93.0-r0 Fix: upgrade to 93.0-r0
|
Original advisory text
During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash
CVE-2021-38496 affects multiple packages. During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. See references for individual vulnerability details.
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit (estimated)
- Gives an attacker full control (estimated)
Timeline
Published31 Oct 2026
Updated31 Oct 2026
First seen31 Oct 2026
Sources
CLEANSTART-2024-CE12645 · OSV
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