In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2. Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26950 Reference (s):
- https://www.mozilla.org/security/advisories/mfsa2020-49/
- URL: https://www.mozilla.org/security/advisories/mfsa2020-49/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1675905
- URL: https://bugzilla.mozilla.org/show_bug.cgi?id=1675905