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CVE WatchSep 1, 2026

CVE-2026-84639

Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbir

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

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.

Official references
Related CVEs

No related CVEs by CWE or product.

CVE-2026-84639 — Triggering an error condition in certain MIME bodies would cause uninitialized m · Pulse | Pulse