Denial-of-service in the Exchange email component

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-110249
StatePUBLISHED
Assignermozilla
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-13 19:18:49 UTC
Updated2026-10-13 19:30:29 UTC
DescriptionA 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 Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mozilla Thunderbird unaffected 153.5 153.* rpm Not specified
CNA Mozilla Thunderbird unaffected 158 * rpm Not specified

References

ReferenceSourceLinkTags
bugzilla.mozilla.org/show_bug.cgi [email protected] bugzilla.mozilla.org
www.mozilla.org/security/advisories/mfsa2026-110 [email protected] www.mozilla.org
www.mozilla.org/security/advisories/mfsa2026-109 [email protected] www.mozilla.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: SuyZ (en)

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