CVE-2026-12306 | BDVDB-2026-340710 Detail

MozillaFirefox

Description#

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

Per CVSS v3.1: confidentiality impact low, integrity impact none, availability impact none. Attack vector: network.

No public exploit known

5.3 Medium

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 18.0.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Memory Corruption

No specific action is recorded in the source data. Check the references for vendor guidance.

Not available

5.3 Medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).