by Kastro
Paper/Archive/CVE-2026-0892

CVE-2026-0892

Mozilla Firefox — Memory safety bugs fixed in Firefox 147 and Thunderbird 147

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
37
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 39.3.393 × 207.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Memory safety bugs present in Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory147CNA
Thunderbirdsee advisory147CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refbugzilla.mozilla.org/buglist.cgi?bug_id=1986912%2C1996718%2C1999633%2C2001081%2C2004443refmozilla.org/security/advisories/mfsa2026-01refmozilla.org/security/advisories/mfsa2026-04