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CVE WatchSep 1, 2026

CVE-2026-84640

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 15

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 1, 2026 · Last modified: Sep 1, 2026

EPSS · 30d

Not enough EPSS history yet.

Technical description

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Official references
Related CVEs

No related CVEs by CWE or product.