{"id":"RUSTSEC-2026-0329","aliases":[],"status":"published","title":"Auto-Reseeding HMAC-DRBG could panic for some output lengths","description":"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.\n\n# Impact\n\nAn 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.\n\nAny calls with output buffer lengths not cleanly divisible by `65_536` are not affected.\n\n# Mitigation\n\nWith 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.\n\nWe recommend users upgrade to `libcrux-hmac-drbg` version `0.0.2`.","severity":{"version":"4.0","score":8.2,"vector":"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","level":"high","from":"osv"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2026-08-03T12:00:00Z","modified":"2026-10-07T08:30:02Z","fixes":[{"ecosystem":"crates.io","package":"libcrux-hmac-drbg","fixed_in":["0.0.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"crates.io","package":"libcrux-hmac-drbg","ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.0-0"},{"fixed":"0.0.2"}]}]}],"references":[{"url":"https://crates.io/crates/libcrux-hmac-drbg","tags":["package"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0329.html","tags":["advisory"]},{"url":"https://github.com/celabshq/libcrux/pull/1558","tags":["web"]}],"sources":{"osv":[{"id":"RUSTSEC-2026-0329","title":"Auto-Reseeding HMAC-DRBG could panic for some output lengths","description":"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.\n\n# Impact\n\nAn 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.\n\nAny calls with output buffer lengths not cleanly divisible by `65_536` are not affected.\n\n# Mitigation\n\nWith 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.\n\nWe recommend users upgrade to `libcrux-hmac-drbg` version `0.0.2`.","status":"published","published":"2026-08-03T12:00:00Z","modified":"2026-10-07T08:30:02.846769865Z","cvss":[{"version":"4.0","score":8.2,"vector":"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","level":"high"}],"updated_at":"2026-11-02T15:53:40.430679Z"}]}}