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Pointer Offset Overflow in onig #2571

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20 changes: 20 additions & 0 deletions crates/onig/RUSTSEC-0000-0000.md
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "onig"
date = "2025-10-18"
url = "https://github.com/rust-onig/rust-onig/issues/206"

[versions]
patched = []
```

# Pointer Offset Overflow in onig

A pointer offset overflow vulnerability has been discovered in the Region::pos method of the rust-onig library. The method performs an unchecked conversion from usize to isize, which can lead to address calculation overflow in the subsequent ptr::offset operation.

Crash Information:
Error Type: unsafe precondition(s) violated: ptr::offset requires the address calculation to not overflow
Location: region.rs in Region::pos
Root Cause: Conversion of usize values greater than isize::MAX to isize causes integer overflow