cve.bz

CVE-2026-84641

7.5 highEPSS 0.3%

High (7.5) in mozilla thunderbird. EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
0.3% chance of exploitation in the next 30 days; higher than 18% of CVEs (scores of 2026-10-31)
CWE
CWE-416
Published
Modified
Record from
the NVD, synced

Affected

References

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