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CVE PROGRAM SOURCE RECORD9.6 Critical

CVE-2026-100818

Sandbox escape due to use-after-free in the Widget: Gtk component

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Status
Published
Published
Updated
Assigning organization
mozilla

Description

Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

Affected products

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

Mozilla Thunderbird

  • 140.17 to ≤ 140.*unaffected
  • 153.4 to ≤ 153.*unaffected
  • 157 to ≤ *unaffected

Mozilla Firefox

  • 140.17 to ≤ 140.*unaffected
  • 153.4 to ≤ 153.*unaffected
  • 157 to ≤ *unaffected

References