CVE-2026-84639 — Uninitialized memory in MIME parsing
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 Thunde…
Published: 2026-09-01 · CVSS: 9.1 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7