fkie_cve-2026-53530

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.

GHSA-4hgp-59h5-gvrj — ratex-parser panics on `\verb` with a multibyte delimiter (UTF-8 byte-boundary slice)

Affected: crates.io: ratex-parser

### Summary

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.

### Details

## Affected code

`crates/ratex-parser/src/parser.rs`, `parse_symbol_inner`:

```rust if let Some(stripped) = text.strip_prefix("\\verb") { // parser.rs:901 self.consume(); let arg = stripped.to_string(); // e.g. "éxé" let star = arg.starts_with('*'); let arg = if star { &arg[1..] } else { &arg }; // parser.rs:905 (also byte-sliced) if arg.len() < 2 { // byte length return Err(ParseError::new("\\verb assertion failed", Some(&nucleus))); } let body = arg[1..arg.len() - 1].to_string(); // parser.rs:910 <-- PANIC on multibyte delimiter ... } ```

For input `\verbéxé`: `arg = "éxé"`, where `é` = `U+00E9` (bytes `C3 A9`). `arg.len()` is the **byte** length (5), the `< 2` guard…

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fkie_cve-2026-53530

GHSA-4hgp-59h5-gvrj — ratex-parser panics on `\verb` with a multibyte delimiter (UTF-8 byte-boundary slice)