The vulnerabilities of Firefox and Firefox ESR browsers, as well as the Thunderbird email client, are related to an unacceptable grid size during QCMS transformations. This allows attackers to disclose protected information.

The vulnerability of Firefox and Firefox ESR browsers, as well as the Thunderbird email client, is related to an unacceptable grid size during QCMS transformations. Exploiting this vulnerability allows a malicious actor to disclose sensitive information obtained by reading beyond the buffer limit...