Mozilla Firefox ESR (ca) 140.12.0
Mozilla Firefox ESR (ca) 140.12.0, released June 16, 2026, fixes 2 CVEs in Mozilla Firefox ESR (ca). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Firefox ESR (ca) is 153.7.0, which also fixes every one of these CVEs.
Superseded. The latest Mozilla Firefox ESR (ca) is 153.7.0, which also fixes every CVE on this page. Install that instead.
Priority of the 2 CVEs
Applies to
| Product | Version |
|---|---|
| Mozilla Firefox ESR (ca) | 140.12.0 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| High | CVE-2026-12329 | Memory safety bug fixed in Thunderbird ESR 140.12 | 7.5 | 0.0031 | None reported |
| High | CVE-2026-12330 | Incorrect boundary conditions in the Internationalization component | 7.5 | 0.0016 | None reported |
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