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Vulnerability record · CVE-2026-57962 · published 1 July 2026

CVE-2026-57962: Mozilla thunderbird uncontrolled resource consumption vulnerability

Mozilla · Thunderbird

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.

5.3 CVSS 3.1 Medium EPSS 0.34% · top 74.9% CWE-400 · Uncontrolled resource consumption
5.3CVSS 3.1 base score
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
6 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=2042872 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-63/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-64/ Vendor Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-57962), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.