CVE-2026-0891

Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, 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, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

Score
CVSS 3.1 8.1 High
Status
Modified - security@mozilla.org
Published
2026-01-13
Last modified
2026-07-15
Weaknesses
CWE-119

Affected products

References

 
 
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