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Mozilla Thunderbird up to 60.7.0 iCal icalrecur_add_bydayrules Email Message memory corruption

A vulnerability, which was classified as critical, was found in Mozilla Thunderbird up to 60.7.0 (Mail Client Software). Affected is the function icalrecur_add_bydayrules of the component iCal Handler. Upgrading to version 60.7.1 eliminates this vulnerability.