{"id":"RUSTSEC-2026-0207","summary":"Incorrect Output of Incremental Portable SHAKE API on Multiple Squeeze Calls","details":"The incremental squeeze functions in the portable SHAKE XOF API, when\nattempting to squeeze an output using multiple calls to `squeeze`,\nrather than squeezing the full output at once, could output incorrect\nvalues. Internally, output blocks that were not completely squeezed\nwere not buffered for the next call to `squeeze`, which would\nconsequently drop bytes of the correct squeeze output if the preceding\ncall requested an output of length in bytes not cleanly divisible by\n`RATE` (168 for SHAKE128, 136 for SHAKE256).\n\n## Impact\nThis bug impacts users that rely on this XOF API to squeeze output in\nmultiple calls where any of the calls request an output length that is\nnot divisible by `RATE`. It does not impact the use of libcrux-sha3 in\nlibcrux-ml-kem or libcrux-ml-dsa.\n\n## Mitigation\nStarting from version `0.0.10` the squeeze functions correctly output\nall squeezed bytes independent of the number of `squeeze` calls and\nthe output lengths requested in each call.","modified":"2026-07-17T11:45:03.729477177Z","published":"2026-04-22T12:00:00Z","database_specific":{"license":"CC0-1.0"},"references":[{"type":"PACKAGE","url":"https://crates.io/crates/libcrux-sha3"},{"type":"ADVISORY","url":"https://rustsec.org/advisories/RUSTSEC-2026-0207.html"},{"type":"WEB","url":"https://github.com/celabshq/libcrux/pull/1389"}],"affected":[{"package":{"name":"libcrux-sha3","ecosystem":"crates.io","purl":"pkg:cargo/libcrux-sha3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.0.0-0"},{"fixed":"0.0.10"}]}],"ecosystem_specific":{"affects":{"arch":[],"os":[],"functions":["libcrux_sha3::portable::incremental::Shake128Xof::squeeze","libcrux_sha3::portable::incremental::Shake256Xof::squeeze"]},"affected_functions":null},"database_specific":{"informational":null,"source":"https://github.com/rustsec/advisory-db/blob/osv/crates/RUSTSEC-2026-0207.json","categories":[],"cvss":"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"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}