Buffer overflow in the log2vis_utf8 function in pyfribidi.c in GNU
FriBidi 0.19.1, 0.19.2, and possibly other versions, as used in
PyFriBidi 0.10.1, allows remote attackers to cause a denial of service
(crash) and possibly execute arbitrary code via a crafted Arabic UTF-8
string that causes original 2-byte UTF-8 sequences to be transformed
into 3-byte sequences.
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