🛡️ GHSA-q29p-9pfr-j652 — libcrux-sha3

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-682 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

libcrux-sha3: Incorrect output from SHAKE squeeze functions

The incremental squeeze functions in the portable SHAKE XOF API, when attempting to squeeze more than RATE (168 for SHAKE128, 136 for SHAKE256) bytes, performed an additional permutation of the state before producing the first output block, thus discarding the first block of RATE bytes of valid XOF output.

Impact

This bug impacts users that rely on this XOF API to squeeze more than RATE bytes. It does not impact the use of libcrux-sha3 in libcrux-ml-kem or libcrux-ml-dsa.

Mitigation

Starting from version 0.0.8 the squeeze functions correctly output all blocks including the first block.

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 high, availability none.

Affected software

GHSA-q29p-9pfr-j652 is recorded against 1 package.

  • libcrux-sha3

Timeline and source

Published on 26 March 2026 and last revised on 14 May 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Package)
rustsec.org (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CWE CWE-682
Public Exploit ✅ No
Source OSV
Published 2026-03-26
Updated 2026-08-12
Modified 2026-05-14
Fix URL N/A

Affected Packages

Software From version Fixed in
libcrux-sha3 — —

Similar Threats

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