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Security Vulnerabilities fixed in Thunderbird 140.11 — Mozilla

🗓️ 19 May 2026 00:00:00Reported by Mozilla FoundationType 
mozilla
 mozilla
🔗 www.mozilla.org👁 6 Views

Security vulnerabilities fixed in Thunderbird 140.11; memory safety issues in 140.10 and 150 could allow code execution.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
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CVE-2026-8946
19 May 202612:29
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CVE-2026-8947
19 May 202612:29
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CVE-2026-8953
19 May 202612:29
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CVE-2026-8949
19 May 202612:29
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CVE-2026-8401
12 May 202614:24
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Tenable Nessus
AlmaLinux 9 : firefox (ALSA-2026:21378)
3 Jun 202600:00
nessus
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Vulners
Node
mozillathunderbirdRange<140.11

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19 May 2026 00:00Current
6Medium risk
Vulners AI Score6
CVSS 3.19.8
EPSS0.00109
SSVC
6