CVE-2026-57962
Medium
Description
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Mozilla Thunderbird
PublishedJul 1, 2026
First seenJul 1, 2026
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- mozilla thunderbird140.12.1, 152.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla thunderbird | v < 140.12.1, v < 152.0.1 | 140.12.1, 152.0.1 |
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