RUSTSEC-2026-0330
Hybrid Encapsulation from Seed Panics on Short Seed
For a hybrid KEM public key of type PublicKey::WingKemDraft06 or PublicKey::X25519MlKem768Draft06, the PublicKey::encapsulate_derand function would panic in an indexing operation on a seed input of length shorter than 32 bytes.
Impact
Applications encapsulating with an attacker controlled seed value could be made to panic. Since the encapsulation seed should be considered a secret of the encapsulating party for the KEM to remain secure, an application should never take the seed value from a potentially attacker controlled source.
Mitigation
With release of version 0.0.10 of libcrux-kem this bug has been fixed and the serialization functions return InvalidPrivateKey and InvalidPublicKey errors on invalid input buffer lengths.
We recommend users upgrade to libcrux-kem version 0.0.10.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
What each source reports
OSV Score used
Hybrid Encapsulation from Seed Panics on Short Seed
For a hybrid KEM public key of type PublicKey::WingKemDraft06 or PublicKey::X25519MlKem768Draft06, the PublicKey::encapsulate_derand function would panic in an indexing operation on a seed input of length shorter than 32 bytes.
Impact
Applications encapsulating with an attacker controlled seed value could be made to panic. Since the encapsulation seed should be considered a secret of the encapsulating party for the KEM to remain secure, an application should never take the seed value from a potentially attacker controlled source.
Mitigation
With release of version 0.0.10 of libcrux-kem this bug has been fixed and the serialization functions return InvalidPrivateKey and InvalidPublicKey errors on invalid input buffer lengths.
We recommend users upgrade to libcrux-kem version 0.0.10.
- Record
RUSTSEC-2026-0330- CVSS 4.0
- 5.6 Medium
CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N - Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
libcrux-kemcrates.io | 0.0.0-0 up to 0.0.10 | 0.0.10 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
RUSTSEC-2026-0330 is a medium vulnerability (CVSS 5.6) in libcrux-kem, published September 28, 2026. No source lists public exploit code. Fixed in libcrux-kem 0.0.10.