| Title | grass 0.13.4 Denial of Service |
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| Description | grass is a pure-Rust Sass-to-CSS compiler. When the parser encounters a syntax error, it constructs a diagnostic via `grass_compiler::raw_to_parse_error`, which hands the byte-offset error span to the `codemap` crate for line/column resolution. If the error span boundary falls inside a multi-byte UTF-8 character, `codemap::File::find_line_col` attempts `&source[start..end]` on a non-char-boundary index and Rust panics with `"byte index N is not a char boundary; it is inside ..."`. The panic propagates up through the public `grass::from_string` API and aborts the process.
This violates the documented contract that `grass::from_string` returns `Result<String, Box<grass::Error>>` for all inputs, but a malformed SCSS source should yield `Err`, not crash the process. |
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| Source | ⚠️ https://github.com/connorskees/grass/issues/116 |
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| User | Zyz3366 (UID 97230) |
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| Submission | 06/03/2026 04:40 (1 month ago) |
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| Moderation | 07/03/2026 20:40 (1 month later) |
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| Status | Accepted |
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| VulDB entry | 376163 [connorskees grass up to 0.13.4 UTF-8 Character raw_to_parse_error denial of service] |
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| Points | 20 |
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