GHSA-q29p-9pfr-j652 Incorrect Output of Incremental Portable SHAKE API
Incorrect output generation in the SHAKE XOF API when squeezing large amounts of data, potentially leading to invalid cryptographic results.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-q29p-9pfr-j652?
GHSA-q29p-9pfr-j652 is a vulnerability in libcrux-sha3, published on 4 Mar 2026.
Official description
The incremental squeeze functions in the portable SHAKE XOF API, when
attempting to squeeze more than RATE (168 for SHAKE128, 136 for
SHAKE256) bytes, performed an additional permutation of the state
before producing the first output block, thus discarding the first
block of RATE bytes of valid XOF output.
Impact
This bug impacts users that rely on this XOF API to squeeze more than
RATE bytes. It does not impact the use of libcrux-sha3 in
libcrux-ml-kem or libcrux-ml-dsa.
Mitigation
Starting from version 0.0.8 the squeeze functions correctly output
all blocks including the first block.
Which versions are affected by GHSA-q29p-9pfr-j652?
3 open source packages ship an affected version, including libcrux-sha3.
| Package | Affected | Fixed in |
|---|---|---|
libcrux-sha3 crates.io | All versions | 0.0.8 |
libcrux-sha3 crates.io | All versions | 0.0.8 |
libcrux-sha3 crates.io | From 0.0.0-0 | 0.0.8 |
How do I fix GHSA-q29p-9pfr-j652?
Upgrade libcrux-sha3 to 0.0.8 or later.
Is GHSA-q29p-9pfr-j652 being exploited?
There is no known exploitation of GHSA-q29p-9pfr-j652 in the wild and no public exploit code.
Sources
Also known as RUSTSEC-2026-0074.