RUSTSEC-2026-0126 AVX2 Implementation Did Not Fully Reduce Intermediate Values
An incomplete reduction in the AVX2 implementation of ML-DSA can cause panics, potentially leading to denial of service in applications using the library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is RUSTSEC-2026-0126?
RUSTSEC-2026-0126 is a denial of service vulnerability in libcrux-ml-dsa, published on 27 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The AVX2 implementation of ML-DSA did not fully reduce intermediate inputs to the inverse NTT, which leads to a testable difference in panic behaviour of internal functions compared to the portable implementation.
Impact
We are not aware of inputs to the public key generation, signing or verification APIs that trigger a panic in the AVX2 implementation because the intermediate values were not fully reduced.
Mitigation
From version 0.0.9 intermediate values on AVX2 platforms are fully
reduced in alignment with the portable implementation.
Which versions are affected by RUSTSEC-2026-0126?
1 open source package ship an affected version, including libcrux-ml-dsa.
| Package | Affected | Fixed in |
|---|---|---|
libcrux-ml-dsa crates.io | From 0.0.0-0 | 0.0.9 |
How do I fix RUSTSEC-2026-0126?
Upgrade libcrux-ml-dsa to 0.0.9 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is RUSTSEC-2026-0126 being exploited?
There is no known exploitation of RUSTSEC-2026-0126 in the wild and no public exploit code.