Memory Safety Violation via Malformed Mail Header in Thunderbird <140.16
CVE-2026-92238 Published on September 15, 2026
Ambiguous parsing of mail headers
A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Products Associated with CVE-2026-92238
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Affected Versions
Mozilla Thunderbird:- Version 140.16, <= 140.* is unaffected.
- Version 153.3, <= 153.* is unaffected.
- Version 156, <= * is unaffected.