Auto-Reseeding HMAC-DRBG could panic for some output lengths

The automatically reseeding implementations of HMAC-DRBG would panic if called with a desired non-zero output length cleanly divisible by `65_536`, the maximum number of output bytes that can be generated before reseeding has to happen. # Impact An application relying on `libcrux-hmac-drgb` to provide randomness of byte length a non-zero integer multiple of `65_536` in a single call to `fill_bytes` would panic. Any calls with output buffer lengths not cleanly divisible by `65_536` are not affected. # Mitigation With release the release of version `0.0.2` of `libcrux-hmac-drbg` this bug has been fixed and reseeding DRBG implementations can be used with arbitrary output lengths. We recommend users upgrade to `libcrux-hmac-drbg` version `0.0.2`.

Source published

3 Aug 2026 12:00:00 UTC

Source modified

7 Oct 2026 08:30:02 UTC

Observed here

24 Oct 2026 13:19:54 UTC

Source terms

OSV · upstream source license applies

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CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N