Hi, We found that there is an opportunity of out-of-bound read access in old harfbuzz.
src/harfbuzz-tibetan.c contains tibetanForm table. It looks the table is supposed to be referenced in the character range U+0F40-U+0FC0, but tibetan_nextSyllableBoundary() could refer the table with characters whose codepoint is out of the range (e.g. U+0F21). Since OOB access could be a security issue, we'd like to fix the problem. Attached a workaround to avoid this problem. I'd appreciate if you could take a look at it. Thanks,
tibetan.diff
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