When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6. Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26974 Reference (s):
- https://bugzilla.mozilla.org/show_bug.cgi?id=1681022
- URL: https://bugzilla.mozilla.org/show_bug.cgi?id=1681022
- https://www.mozilla.org/security/advisories/mfsa2020-54/
- URL: https://www.mozilla.org/security/advisories/mfsa2020-54/
- https://www.mozilla.org/security/advisories/mfsa2020-55/