How severe is GHSA-xrf2-5r3p-5wgj?

No CVSS score has been assigned to GHSA-xrf2-5r3p-5wgj yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-xrf2-5r3p-5wgj?

GHSA-xrf2-5r3p-5wgj affects the following packages: libcrux-ml-dsa (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-xrf2-5r3p-5wgj?

Update libcrux-ml-dsa to 0.0.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xrf2-5r3p-5wgj is resolved across your whole dependency graph.

How do I detect GHSA-xrf2-5r3p-5wgj in my crates.io dependencies?

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

How do I mitigate GHSA-xrf2-5r3p-5wgj 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.

How does O3 Security protect against GHSA-xrf2-5r3p-5wgj?

O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-xrf2-5r3p-5wgj can be triaged on real exposure rather than presence alone.

Is GHSA-xrf2-5r3p-5wgj actively exploited in the wild?

No public exploit code has been indexed for GHSA-xrf2-5r3p-5wgj 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-xrf2-5r3p-5wgj published, and has it been updated?

GHSA-xrf2-5r3p-5wgj was published on March 26, 2026 and was last updated on March 27, 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

GHSA-xrf2-5r3p-5wgj — libcrux-ml-dsa

Fix: cryspen/libcrux#1348

GHSA-xrf2-5r3p-5wgj is a security vulnerability in libcrux-ml-dsa. A fix is available for libcrux-ml-dsa — see the affected versions and patch details below.

libcrux: Panic in Signature Hint Decoding During Verification

Also known asRUSTSEC-2026-0076

Published

Mar 26, 2026

Updated

Mar 27, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Mar 27, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🦀libcrux-ml-dsa

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

During ML-DSA verification the serialized hint values are decoded as specified in algorithm 22 HintBitUnpack of FIPS 204, subsection 7.1. The algorithm requires that the cumulative hint counters per row of the hint vector are strictly increasing and below a maximum value which depends on the choice of ML-DSA parameter set (line 4).

In libcrux-ml-dsa, hint decoding did not check the boundedness of the cumulative hint counter of the last row of the hint vector.

Impact

A manipulated invalid hint can cause an out-of-bounds memory access since the hint decoding logic may attempt to read outside the bounds of the serialized signature, causing a runtime panic.

Mitigation

Starting from version 0.0.8, hint decoding will check the cumulative hint counter of the last row as well.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`libcrux-ml-dsa`	all versions	0.0.8`cargo update -p libcrux-ml-dsa --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-ml-dsa, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update libcrux-ml-dsa to 0.0.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xrf2-5r3p-5wgj 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.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-xrf2-5r3p-5wgj can be triaged on real exposure rather than presence alone.

Tailored to GHSA-xrf2-5r3p-5wgj. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

During ML-DSA verification the serialized hint values are decoded as specified in algorithm 22 `HintBitUnpack` of [FIPS 204, subsection 7.1](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.204.pdf#%5B%7B%22num%22%3A120%2C%22gen%22%3A0%7D%2C%7B%22name%22%3A%22FitH%22%7D%2C657%5D). The algorithm requires that the cumulative hint counters per row of the hint vector are strictly increasing and below a maximum value which depends on the choice of ML-DSA parameter set (line 4). In libcrux-ml-dsa, hint decoding did not check the boundedness of the cumulative hint counter of the last row of the hint

O3 Security · Impact-Aware SCA

Is GHSA-xrf2-5r3p-5wgj in your dependencies?

O3 Security finds GHSA-xrf2-5r3p-5wgj across crates.io dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.

Scan my dependencies How O3 SCA works