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CVE PROGRAM SOURCE RECORD8.1 High

CVE-2026-0891

Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147

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Status
Published
Published
Updated
Assigning organization
mozilla

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mozilla Firefox

  • 140.7 to ≤ 140.*unaffected
  • 147 to ≤ *unaffected

Mozilla Thunderbird

  • 140.7 to ≤ 140.*unaffected
  • 147 to ≤ *unaffected

References