CVE-2026-0878

Summary

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

Affected Software

VendorProductVersion RangeStatus
MozillaFirefox140.7 <= 140.*unaffected
MozillaFirefox147 <= *unaffected
MozillaThunderbird140.7 <= 140.*unaffected
MozillaThunderbird147 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Additional References

References