CVE-2026-110249
thunderbird: Denial-of-service in the Exchange email component
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 14, 2026
Updated · November 3, 2026
Description
A flaw was found in Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: 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.
Statement
Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 3.4CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N
CWE-770 · Allocation of Resources Without Limits or Throttling