GHSA-q29p-9pfr-j652
libcrux-sha3: Incorrect output from SHAKE squeeze functions
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
What each source reports
GitHub Advisories Score used
libcrux-sha3: Incorrect output from SHAKE squeeze functions
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.
- Record
GHSA-q29p-9pfr-j652- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-682
- Updated
- 2026-11-02
OSV
libcrux-sha3: Incorrect output from SHAKE squeeze functions
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.
- Record
GHSA-q29p-9pfr-j652- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-682
- Updated
- 2026-11-02
OSVRUSTSEC-2026-0074No score
Incorrect Output of Incremental Portable SHAKE API
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.
- Record
RUSTSEC-2026-0074- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libcrux-sha3crates.io | before 0.0.8 | 0.0.8 |
libcrux-sha3crates.io | 0.0.0-0 up to 0.0.8 | 0.0.8 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
GHSA-q29p-9pfr-j652 is a high vulnerability (CVSS 8.7) in libcrux-sha3, published March 4, 2026. No source lists public exploit code. Fixed in libcrux-sha3 0.0.8.