AIKIDO-2026-243648
libcrux-sha3 is vulnerable to Improper Validation of Array Index
82
High Risk
This Affects:
libcrux-sha3TL;DR
A flaw in the AVX2-optimized SHAKE-256 implementation could cause a panic due to an out-of-bounds indexing operation when processing output buffers larger than 32 bytes whose length is not a multiple of 8. An attacker able to trigger this code path with specially crafted input could cause a denial of service by crashing the application. This issue does not affect ML-KEM or ML-DSA, as they only use output buffer lengths that are multiples of 8.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you are using the libcrux_sha3::avx2::x4::shake256 function.
Background info
libcrux-sha3 is vulnerable to Improper Validation of Array Index in versions 0.0.0 - 0.0.9.
How to fix this
Upgrade the libcrux-sha3 library to the patch version.
Are You Affected?
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