CVE-2017-5438: Mozilla: Use-after-free in nsAutoPtr during XSLT processing (MFSA 2017-11, MFSA 2017-12)

Severity: Critical

CVSS Score: 9.8

A use-after-free vulnerability during XSLT processing due to the result handler being held by a freed handler during handling. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.