RaTeX is a KaTeX-compatible math rendering engine written in Rust. Prior to version 0.1.11, the public parser entrypoint "ratex_parser::parse(&str)" panics on the 9-byte input "\verbéxé" (i.e. "\verb" followed by the non-ASCII delimiter "é"). When handling a "\verb" command, the parser slices the verbatim argument with byte indices ("arg[1..arg.len() - 1]"); if the delimiter character is multibyte UTF-8, index "1" lands inside that character and Rust panics with “byte index 1 is not a char boundary”. Because RaTeX’s release profile sets "panic = "abort"" ("Cargo.toml:48"), the panic aborts the entire process — not just the current request/thread — making this a hard denial of service for any service that renders untrusted LaTeX. Version 0.1.11 fixes the issue.