CVE-2026-110249

HighCVSS 8.6/10Last modified Oct 20, 2026

Description

A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep Thunderbird's main thread CPU-bound for seconds to hours. This vulnerability was fixed in Thunderbird 158 and Thunderbird 153.5.

Metrics

CVSS 3.1 8.6/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-400

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Mozilla	Thunderbird	—

References

Timeline

Published: Oct 13, 2026
Last modified: Oct 20, 2026
NVD status: Awaiting Analysis

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