Vulnerability Details CVE-2026-14899
The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 19.6%
CVSS Severity
CVSS v3 Score 7.5
References
Products affected by CVE-2026-14899
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cpe:2.3:a:mozilla:thunderbird:115.10.2
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cpe:2.3:a:mozilla:thunderbird:115.11.0
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cpe:2.3:a:mozilla:thunderbird:115.11.1
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cpe:2.3:a:mozilla:thunderbird:115.12.1
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cpe:2.3:a:mozilla:thunderbird:115.12.2
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cpe:2.3:a:mozilla:thunderbird:115.13.0
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cpe:2.3:a:mozilla:thunderbird:115.14.0
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cpe:2.3:a:mozilla:thunderbird:115.16.0
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cpe:2.3:a:mozilla:thunderbird:115.16.1
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cpe:2.3:a:mozilla:thunderbird:115.16.2
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cpe:2.3:a:mozilla:thunderbird:115.16.3
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cpe:2.3:a:mozilla:thunderbird:115.18.0
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cpe:2.3:a:mozilla:thunderbird:128.0.1
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cpe:2.3:a:mozilla:thunderbird:128.1.0
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cpe:2.3:a:mozilla:thunderbird:128.1.1
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cpe:2.3:a:mozilla:thunderbird:128.10.0
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cpe:2.3:a:mozilla:thunderbird:128.10.1
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cpe:2.3:a:mozilla:thunderbird:128.10.2
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cpe:2.3:a:mozilla:thunderbird:128.11.0
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cpe:2.3:a:mozilla:thunderbird:128.11.1
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cpe:2.3:a:mozilla:thunderbird:128.12.0
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cpe:2.3:a:mozilla:thunderbird:128.13.0
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cpe:2.3:a:mozilla:thunderbird:128.14.0
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cpe:2.3:a:mozilla:thunderbird:128.2.0
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cpe:2.3:a:mozilla:thunderbird:128.2.1
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cpe:2.3:a:mozilla:thunderbird:128.2.2
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cpe:2.3:a:mozilla:thunderbird:128.2.3
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cpe:2.3:a:mozilla:thunderbird:128.3.0
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cpe:2.3:a:mozilla:thunderbird:128.3.1
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cpe:2.3:a:mozilla:thunderbird:128.3.2
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cpe:2.3:a:mozilla:thunderbird:128.3.3
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cpe:2.3:a:mozilla:thunderbird:128.4.0
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cpe:2.3:a:mozilla:thunderbird:128.4.1
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cpe:2.3:a:mozilla:thunderbird:128.4.2
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cpe:2.3:a:mozilla:thunderbird:128.4.3
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cpe:2.3:a:mozilla:thunderbird:128.4.4
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cpe:2.3:a:mozilla:thunderbird:128.5.0
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cpe:2.3:a:mozilla:thunderbird:128.5.1
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cpe:2.3:a:mozilla:thunderbird:128.5.2
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cpe:2.3:a:mozilla:thunderbird:128.6.0
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cpe:2.3:a:mozilla:thunderbird:128.7.0
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cpe:2.3:a:mozilla:thunderbird:128.7.1
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cpe:2.3:a:mozilla:thunderbird:128.8.0
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cpe:2.3:a:mozilla:thunderbird:128.8.1
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cpe:2.3:a:mozilla:thunderbird:128.9.0
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cpe:2.3:a:mozilla:thunderbird:128.9.1
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cpe:2.3:a:mozilla:thunderbird:128.9.2
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cpe:2.3:a:mozilla:thunderbird:140.0
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cpe:2.3:a:mozilla:thunderbird:140.0.1
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cpe:2.3:a:mozilla:thunderbird:140.1.0
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cpe:2.3:a:mozilla:thunderbird:140.1.1
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cpe:2.3:a:mozilla:thunderbird:140.10.1
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cpe:2.3:a:mozilla:thunderbird:140.2.0
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cpe:2.3:a:mozilla:thunderbird:140.2.1
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cpe:2.3:a:mozilla:thunderbird:140.3.0
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cpe:2.3:a:mozilla:thunderbird:140.3.1
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cpe:2.3:a:mozilla:thunderbird:140.4.0
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cpe:2.3:a:mozilla:thunderbird:140.5.0
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cpe:2.3:a:mozilla:thunderbird:140.6.0
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cpe:2.3:a:mozilla:thunderbird:140.7.0
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cpe:2.3:a:mozilla:thunderbird:140.8.1
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cpe:2.3:a:mozilla:thunderbird:140.9.0
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cpe:2.3:a:mozilla:thunderbird:140.9.1