Medium [CVE-2026-57962] Denial of Service via malicious LDAP server
This medium-severity Red Hat Linux advisory covers CVE-2026-57962.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
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.
A remote attacker, by operating a malicious Lightweight Directory Access Protocol (LDAP) server, can cause a Thunderbird client to crash due to memory exhaustion. This can lead to a Denial of Service (DoS) for the affected user.
Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-1050.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Is CVE-2026-57962 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-57962 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-57962?
Upgrade to a fixed release named by Red Hat:
- 152.0.1
- 140.12.1
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
- 152.0.1
- 140.12.1
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Mitigation
Upgrade to a fixed release: 152.0.1, 140.12.1. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
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