PT-2026-27357 · Crates.Io · Libcrux-Ed25519
Published
2026-03-04
·
Updated
2026-03-04
CVSS v4.0
8.2
High
| Vector | AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N |
The libcrux-ed25519 key generation samples Ed25519 secret keys from a
provided CSPRNG in a loop for up to 100 attempts until a non-zero key
is found. If a non-zero key could not be sampled within 100 attempts
the key generation function would silently continue with an all-zero buffer as
the secret key.
Impact
This bug only occurs in the event of a catastrophic failure of the
CSPRNG, but would allow anyone to forge signatures under the resulting
static signing key.
Mitigation
Instead of silently continuing with an all-zero signing key, starting
from version
0.0.7 key generation will error in the case of 100
failed attempts at sampling a valid key.Fix
Found an issue in the description? Have something to add? Feel free to write us 👾
Related Identifiers
Affected Products
Libcrux-Ed25519