🛡️ RUSTSEC-2026-0208 — libcrux-sha3

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Potential Panic in AVX2 SHAKE-256

The AVX2-optimized implementation of SHAKE-256 intended for use in

ML-KEM and ML-DSA would panic if the length of the output buffers was

greater than 32 and not a multiple of 8, due to an out-of-bounds

indexing operation.

Impact

This bug impacts users on AVX2 platforms that use the

libcrux_sha3::avx2::x4::shake256 API outside of ML-KEM or ML-DSA

with output buffers of length > 32 and not divisible by 8. It does

not impact the use in ML-KEM or ML-DSA because there output buffer

lengths are always divisible by 8.

Mitigation

Starting from version 0.0.10, the AVX2-optimized SHAKE-256 will no

longer panic on output buffer lengths > 32 that are not divisible by

8.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability high.

Affected software

RUSTSEC-2026-0208 is recorded against 1 package.

  • libcrux-sha3

Timeline and source

Published on 21 May 2026 and last revised on 17 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

crates.io (Package)
rustsec.org (Advisory)
github.com (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS 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
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-05-21
Updated 2026-08-12
Modified 2026-07-17
Fix URL N/A

Affected Packages

Software From version Fixed in
libcrux-sha3 — —

Similar Threats

Free Vulnerability Check

Is your site affected by RUSTSEC-2026-0208?

BotEraser helps you identify potentially vulnerable plugins and themes by checking your installation against RUSTSEC-2026-0208 and other known CVE records.

Scan My Site Free →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.