How severe is GHSA-q29p-9pfr-j652?

No CVSS score has been assigned to GHSA-q29p-9pfr-j652 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-q29p-9pfr-j652?

GHSA-q29p-9pfr-j652 affects the following packages: libcrux-sha3 (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-q29p-9pfr-j652?

Update libcrux-sha3 to 0.0.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-q29p-9pfr-j652 is resolved across your whole dependency graph.

How do I detect GHSA-q29p-9pfr-j652 in my crates.io dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for libcrux-sha3, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-q29p-9pfr-j652 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-q29p-9pfr-j652 actively exploited in the wild?

No public exploit code has been indexed for GHSA-q29p-9pfr-j652 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-q29p-9pfr-j652 published, and has it been updated?

GHSA-q29p-9pfr-j652 was published on March 26, 2026 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🦀 crates.io

Not in CISA KEV

libcrux-sha3: Incorrect output from SHAKE squeeze functionsGHSA-q29p-9pfr-j652

Fix: cryspen/libcrux#1352

GHSA-q29p-9pfr-j652 is a security vulnerability in libcrux-sha3. A fix is available for libcrux-sha3 — see the affected versions and patch details below.

Also known asRUSTSEC-2026-0074

Published

Mar 26, 2026

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 10, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🦀libcrux-sha3

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`libcrux-sha3`	all versions	0.0.8`cargo update -p libcrux-sha3 --precise 0.0.8`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for libcrux-sha3, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update libcrux-sha3 to 0.0.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-q29p-9pfr-j652 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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 firs

O3 Security · Impact-Aware SCA

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