🔐 CVE Alert

CVE-2026-0892

CRITICAL 9.8

Memory safety bugs fixed in Firefox 147 and Thunderbird 147

CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th

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.

Vendor mozilla
Product firefox
Ecosystems
Industries
Technology
Published Jan 13, 2026
Last Updated Apr 13, 2026
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Affected Versions

Mozilla / Firefox
All versions affected
Mozilla / Thunderbird
All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗
bugzilla.mozilla.org: https://bugzilla.mozilla.org/buglist.cgi?bug_id=1986912%2C1996718%2C1999633%2C2001081%2C2004443 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-01/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-04/

Credits

Hiroyuki Ikezoe, Jon Coppeard, Maurice Dauer and the Mozilla Fuzzing Team