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v40.2.0
Extra Mitigation Curation
ubuntu_osv/UBUNTU-CVE-2026-84639
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Advisory Summary
ubuntu_osv/UBUNTU-CVE-2026-84639
Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
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