CVE-2023-3417: Debian Linux

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Thunderbird allowed the Text Direction Override Unicode Character in filenames. An email attachment could be incorrectly shown as being a document file, while in fact it was an executable file. Newer versions of Thunderbird will strip the character and show the correct file extension. This vulnerability affects Thunderbird < 115.0.1 and Thunderbird < 102.13.1.

Affected products

• Debian Debian Linux: version 10.0 only; version 11.0 only; version 12.0 only
• Mozilla Thunderbird: before 102.13.1 (fixed in 102.13.1); from 115.0, before 115.0.1 (fixed in 115.0.1)

Published 2023-07-24. Last modified 2026-06-17.