| tiêu đề | cesanta mJS v1.26 Heap-based Buffer Overflow |
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| Mô tả | A heap buffer overflow vulnerability exists in the lexical parsing module of the mjs JavaScript engine.
The vulnerability is located in the `skip_spaces_and_comments()` function in `src/mjs_tok.c`. When parsing specially crafted input, the function fails to properly validate buffer boundaries, allowing it to read data beyond the allocated heap buffer, resulting in a program crash.
This issue was discovered using libFuzzer with AddressSanitizer. The vulnerability can be reliably triggered with an input containing `0x0A` (single newline character).
Affected versions:
- mJS v1.26
- Commit: cf375c4
Vulnerability Type:
Heap-based Buffer Overflow (CWE-122) |
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| Nguồn | ⚠️ https://github.com/cesanta/mjs/issues/324 |
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| Người dùng | lrrh (UID 100159) |
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| Đệ trình | 30/07/2026 13:14 (cách đây 2 các tháng) |
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| Kiểm duyệt | 08/09/2026 13:09 (1 month later) |
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| Trạng thái | Bản sao |
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| Mục VulDB | 399773 [Cesanta mJS đến 1.26 src/mjs_tok.c skip_spaces_and_comments tràn bộ đệm] |
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| điểm | 0 |
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