Description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=538179114
```
Crash type: UNKNOWN READ
Crash state:
bytes1_char_at
unicode_word_left
unicode_at_boundary
```
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | mrab-regex | 10 versions (2026.7.19 … 2026.9.9) | — | OSV-2026-1070 |