GHSA-xrf2-5r3p-5wgj: libcrux Panic Vulnerability

HIGH
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CWE-125 CWE-1285
Published
Advisory Summary

GHSA-xrf2-5r3p-5wgj is a HIGH panic vulnerability (CWE-125: Out-of-bounds Read) affecting libcrux libraries in the crates.io ecosystem. The issue involves panic in signature hint decoding during verification. Remediation is available by upgrading affected packages to version 0.0.8.

GHSA-xrf2-5r3p-5wgj at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-xrf2-5r3p-5wgj
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-125: Out-of-bounds Read
Affected Product libcrux
Package Ecosystem crates.io
Published Date
Last Updated

How to Fix GHSA-xrf2-5r3p-5wgj

To remediate this vulnerability, upgrade all affected libcrux dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

libcrux-ml-dsa fixed: 0.0.8 
Upgrade libcrux-ml-dsa to 0.0.8
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for libcrux-ml-dsa

How to Check if You Are Affected

To determine whether your application is affected by GHSA-xrf2-5r3p-5wgj, inspect your project dependencies for libcrux:

inspect dependencies for libcrux-ml-dsa

Analyze the terminal output to locate any version of libcrux in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.8), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-125: Out-of-bounds Read, where the product reads data past the end, or before the beginning, of the intended buffer. In libcrux, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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 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.

GHSA-xrf2-5r3p-5wgj Affected libcrux Versions

1 component(s)
Fixed Versions:
0.0.8
Product / Package Ecosystem Affected Versions Fixed Version
libcrux-ml-dsa
 crates.io
< 0.0.8
0.0.8

References

libcrux Source Repository REPOSITORY
https://github.com/cryspen/libcrux/pull/1348
libcrux Source Repository REPOSITORY
https://github.com/cryspen/libcrux
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2026-0076.html

Frequently Asked Questions

What is GHSA-xrf2-5r3p-5wgj?
GHSA-xrf2-5r3p-5wgj is a security vulnerability in libcrux involving Panic in Signature Hint Decoding During Verification under CWE-125: Out-of-bounds Read.
Which libcrux versions are affected?
Affected versions include releases prior to 0.0.8 across affected packages: libcrux-ml-dsa.
What version fixes GHSA-xrf2-5r3p-5wgj?
Upgrading to 0.0.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is libcrux-ml-dsa affected?
Yes, libcrux-ml-dsa is affected in releases prior to 0.0.8. Upgrade your dependency to 0.0.8 or later.
What CWE is associated with GHSA-xrf2-5r3p-5wgj?
GHSA-xrf2-5r3p-5wgj is classified under CWE-125: Out-of-bounds Read (The product reads data past the end, or before the beginning, of the intended buffer.).
How can I check crates.io dependencies for GHSA-xrf2-5r3p-5wgj?
Run the dependency tree command: 'inspect dependencies for libcrux-ml-dsa'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-xrf2-5r3p-5wgj",
  "modified" : "2026-03-26T17:58:16Z",
  "published" : "2026-03-26T17:58:16Z",
  "aliases" : [ ],
  "summary" : "libcrux: Panic in Signature Hint Decoding During Verification",
  "details" : "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).\n\nIn libcrux-ml-dsa, hint decoding did not check the boundedness of the cumulative hint counter of the last row of the hint vector.\n\n## Impact\nA 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.\n\n## Mitigation\nStarting from version `0.0.8`, hint decoding will check the cumulative hint counter of the last row as well.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "libcrux-ml-dsa"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.8"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cryspen/libcrux/pull/1348"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cryspen/libcrux"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2026-0076.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-125", "CWE-1285" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-26T17:58:16Z",
    "nvd_published_at" : null
  }
}