| Название | grass 0.13.4 Asymmetric Resource Consumption |
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| Описание | Grass is a pure-Rust Sass-to-CSS compiler.
`grass` implements Sass's nested parent-selector (`&`) and combinator (`+`, `~`, `>`) semantics. When evaluating rulesets that combine multiple parent-selector references inside child blocks separated by adjacent-sibling
or general-sibling combinators, the resolver in `grass_compiler::selector::extend` and `grass_compiler::evaluate::visitor` recursively materializes the cross-product of every (parent × child) combinator combination.
For adversarial nesting patterns this materialization is super-linear in the number of `&` and combinator tokens, and the per-step Vec allocation overhead is non-trivial. An 85-byte SCSS source is sufficient to drive
grass to allocate ~2.5 GiB of memory and spend ~8 seconds of CPU on a single compilation, against a Sass spec where compile time should be linear in input size.
The compiler does eventually return `Ok(_)`, but the memory and CPU footprint makes any service that compiles untrusted SCSS trivially DoS-able with sub-100-byte payloads. |
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| Источник | ⚠️ https://github.com/connorskees/grass/issues/117 |
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| Пользователь | Zyz3366 (UID 97230) |
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| Представление | 03.06.2026 04:42 (1 месяц назад) |
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| Модерация | 03.07.2026 20:40 (1 month later) |
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| Статус | принято |
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| Запись VulDB | 376164 [connorskees grass до 0.13.4 visitor отказ в обслуживании] |
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| Баллы | 20 |
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