High (8.8) in mozilla. EPSS 42% chance of exploitation in the next 30 days.
In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.
Severity
CVSS 3.1
8.8 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
42% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-31)