LibreDWG is a free C library to read and write DWG files. Prior to 0.14, "bit_TV_to_utf8()" in "src/bits.c" can write to the caller-provided "src" buffer despite accepting const input. On an "iconv()" error other than "E2BIG", the function frees its output buffer and passes the original input alias to "bit_u_expand()", which expands or shrinks Unicode and multibyte escape sequences in place. If the input is a string literal, read-only mapping, or other immutable buffer, the write can cause a segmentation fault and denial of service; mutable caller-owned input can be unexpectedly modified before being returned. This affects applications that expose the conversion API to untrusted input under those conditions. Direct file-triggered exploitability through normal DWG decode/export paths remains unconfirmed because many TV strings are heap allocated by bit_read_TV(). This issue is fixed in version 0.14.