CVE-2026-110249

UNKNOWN 0.0

Denial-of-service in the Exchange email component

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	thunderbird
Ecosystems	Browser JavaScript
Industries	Technology
Published	Oct 13, 2026
Last Updated	Oct 13, 2026

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Affected Versions

Mozilla / Thunderbird

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2077826 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-109/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-110/

Credits

SuyZ