| tiêu đề | postcss-selector-parser postcss <= 7.1.1 CWE-674: Uncontrolled Recursion |
|---|
| Mô tả | `postcss-selector-parser` contains a second, independent stack overflow vulnerability in its AST serialization path. The `toString()` method on `Container` and `Pseudo` nodes recurse into each other without any depth limit. An attacker can trigger this by either:
1. Supplying a deeply nested CSS selector string that the parser successfully parses (depth < parser crash threshold), then causing `toString()` to be called on the resulting AST.
2. Constructing a deep AST programmatically via the public API and calling `toString()` directly.
The `toString()` crash threshold (~887 levels) is **independent of and lower than** the parser crash threshold for some pseudo-classes, meaning inputs exist that parse successfully but crash on serialization. The `processor.js` layer calls `root.toString()` internally on every `processSync()` / `process()` call when `updateSelector` is set, making this reachable through normal library usage. |
|---|
| Nguồn | ⚠️ https://gist.github.com/bx33661/581e3a38134601c04e19b4dfc9b459b9 |
|---|
| Người dùng | bx33661 (UID 87537) |
|---|
| Đệ trình | 25/04/2026 17:11 (cách đây 1 tháng) |
|---|
| Kiểm duyệt | 23/05/2026 11:49 (28 days later) |
|---|
| Trạng thái | được chấp nhận |
|---|
| Mục VulDB | 365321 [postcss đến 7.1.1 AST Serialization container.js toString Từ chối dịch vụ] |
|---|
| điểm | 20 |
|---|