RUSTSEC-2026-0123 Out-of-bounds read in `bytes_helper` public safe functions
Attackers can trigger undefined behavior and potential crashes or code execution by calling unsafe public functions with invalid slice positions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- Available
What is RUSTSEC-2026-0123?
RUSTSEC-2026-0123 is a memory corruption vulnerability in rustdx, published on 2 May 2026.
Official description
The bytes_helper module contains multiple public functions
(into_arr4(), into_arr2(), u8_from_le_bytes()) that use
slice.get_unchecked(pos..pos + N) without verifying that
pos + N <= slice.len(). These are public safe API functions, allowing any
caller to trigger undefined behavior by passing invalid positions.
For example, calling into_arr4(&data, 10) where data is a 3-byte slice
causes an out-of-bounds access since position 10 exceeds the slice length.
Which versions are affected by RUSTSEC-2026-0123?
1 open source package ship an affected version, including rustdx.
| Package | Affected | Fixed in |
|---|---|---|
rustdx crates.io | From 0.0.0-0 | 0.4.4 |
How do I fix RUSTSEC-2026-0123?
Upgrade rustdx to 0.4.4 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is RUSTSEC-2026-0123 being exploited?
There is no known exploitation of RUSTSEC-2026-0123 in the wild and no public exploit code.