CVE-2026-57962
A malicious LDAP server, which a Thunderbird user is configured to query for address-book autocomplete, can stash arbitrarily large amounts of attacker-supplied data into the Thunderbird LDAP client until it crashes due to memory exhaustion. This vulnerability was fixed in Thunderbird 152.0.1 and Thunderbird 140.12.1.
- Published Jul 1, 2026
- CVSS 5.3 medium
- 0.3% chance of exploitation in the next 30 days (EPSS)
- A fix is available