🔐 CVE Alert

CVE-2026-84641

UNKNOWN 0.0

Information disclosure due to malicious IMAP server response

CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th

A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response. Heap contents can ultimately be persisted to prefs.js. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Vendor mozilla
Product thunderbird
Ecosystems
Industries
Technology
Published Sep 1, 2026
Last Updated Sep 1, 2026
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Affected Versions

Mozilla / Thunderbird
All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2057805 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-86/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-87/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-88/

Credits

ABDULAZIZ ALASAIQAH