LibreOffice supports embedded fonts in the documents for sometime now, and we use and pass these fonts to font rendering libraries without any checking for there validity. Fonts can be a security risk and malicious fonts can easily crash the system on several platforms. Some web browsers (Google Chrome and Mozilla Firefox) use OpenType Sanitiser to sanitize downloadable webfonts to mitigate such risks, and I think LibreOffice should do the same. https://github.com/khaledhosny/ots
Reasonable, +1 As long as we don't adversely affect the style definitions for documents containing the embedded fonts--assume we replace the fonts detected "corrupt" with available local font equivalent. And I assume provide fallback for a font that has been blocked but has no local instance. On export back to ODF archive we'd embed from the local font instance (or the fallback).
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No security issue about embedded fonts in 5 years, probably not worth it.