| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 52.4.0< 56.0 | 52.4.056.0 |
| thunderbird | < 52.4.0 | 52.4.0 |
Several fonts on OS X display some Tibetan and Arabic characters as whitespace. When used in the addressbar as part of an IDN this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
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