cve.bz

CVE-2026-84640

7.5 highEPSS 0.3%

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

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.

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-126
Published
Modified
Record from
the NVD, synced

Affected

References

Check your stackJSON