8.1
High
CVE-2026-92239 A maliciously constructed IMAP line could cause an out-of-bounds buffer read
Description
A maliciously constructed IMAP line could cause an out-of-bounds buffer read. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Thunderbird 156 | earliest → < 156 | 156 |
| Thunderbird 153.3 | earliest → < 153.3 | 153.3 |
| Thunderbird 140.16 | earliest → < 140.16 | 140.16 |
Other CVEs of Thunderbird
The 1713 CVEs of Thunderbird →
CVE-2026-118180
Matrix homeserver could redirect the chat session to a local file or network share
7.5
High
CVE-2026-118179
Request forgery via news: links
8.8
High
CVE-2026-118177
Calendar discovery accepted local file and remote network share locations
9.1
Critical
CVE-2026-118178
RSS feed could redirect its subscription to a local file or network share
5.7
Medium