thunderbird: When replying to, forwarding, or editing a crafted email message as new, Thunderbird could embed parts of a different...
CVE-2026-118175 is fixed in thunderbird on 1 platform, first by DEBIAN-CVE-2026-118175, released October 31, 2026. It is not reported as exploited. Patch Radar priority: High.
When replying to, forwarding, or editing a crafted email message as new, Thunderbird could embed parts of a different message stored in the same folder into the message being composed, without showing a blocked content warning. If the user sent the message, the content of the other message was disclosed to the recipients. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| thunderbird · Debian 12.15 (bookworm) | 1:153.6.0esr-1~deb12u2 | DEBIAN-CVE-2026-118175 | Oct 31, 2026 |
| thunderbird · Debian 13.5 (trixie) | 1:153.6.0esr-1~deb13u1 | DEBIAN-CVE-2026-118175 | Oct 31, 2026 |
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