GHSA-434v-x5qv-pmh6: Libcrux ed25519 Libcrux Has All-Zero Key Generation Vulnerability

HIGH
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CWE-392 CWE-331 CWE-1240
Published
Advisory Summary

GHSA-434v-x5qv-pmh6 is a HIGH libcrux has all-zero key generation vulnerability (CWE-392: Missing Report of Error Condition) affecting Libcrux ed25519 libraries in the crates.io ecosystem. The issue involves libcrux has all-zero key generation upon catastrophic rng failure. Remediation is available by upgrading affected packages to version 0.0.7.

GHSA-434v-x5qv-pmh6 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-434v-x5qv-pmh6
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-392: Missing Report of Error Condition
Affected Product Libcrux ed25519
Package Ecosystem crates.io
Published Date
Last Updated

How to Fix GHSA-434v-x5qv-pmh6

To remediate this vulnerability, upgrade all affected Libcrux ed25519 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-ed25519 fixed: 0.0.7 
Upgrade libcrux-ed25519 to 0.0.7
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-ed25519

How to Check if You Are Affected

To determine whether your application is affected by GHSA-434v-x5qv-pmh6, inspect your project dependencies for Libcrux ed25519:

inspect dependencies for libcrux-ed25519

Analyze the terminal output to locate any version of Libcrux ed25519 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.7), 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-392: Missing Report of Error Condition, where the product encounters an error but does not provide a status code or return value to indicate that an error has occurred. In Libcrux ed25519, 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

The libcrux-ed25519 key generation samples Ed25519 secret keys from a provided CSPRNG in a loop for up to 100 attempts until a non-zero key is found. If a non-zero key could not be sampled within 100 attempts the key generation function would silently continue with an all-zero buffer as the secret key. ## Impact This bug only occurs in the event of a catastrophic failure of the CSPRNG, but would allow anyone to forge signatures under the resulting static signing key. ## Mitigation Instead of silently continuing with an all-zero signing key, starting from version `0.0.7` key generation will error in the case of 100 failed attempts at sampling a valid key.

GHSA-434v-x5qv-pmh6 Affected Libcrux ed25519 Versions

1 component(s)
Fixed Versions:
0.0.7
Product / Package Ecosystem Affected Versions Fixed Version
libcrux-ed25519
 crates.io
< 0.0.7
0.0.7

References

Libcrux ed25519 Source Repository REPOSITORY
https://github.com/cryspen/libcrux/pull/1349
Libcrux ed25519 Source Repository REPOSITORY
https://github.com/cryspen/libcrux
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2026-0075.html

Frequently Asked Questions

What is GHSA-434v-x5qv-pmh6?
GHSA-434v-x5qv-pmh6 is a security vulnerability in Libcrux ed25519 involving libcrux has All-Zero Key Generation Upon Catastrophic RNG Failure under CWE-392: Missing Report of Error Condition.
Which Libcrux ed25519 versions are affected?
Affected versions include releases prior to 0.0.7 across affected packages: libcrux-ed25519.
What version fixes GHSA-434v-x5qv-pmh6?
Upgrading to 0.0.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is libcrux-ed25519 affected?
Yes, libcrux-ed25519 is affected in releases prior to 0.0.7. Upgrade your dependency to 0.0.7 or later.
What CWE is associated with GHSA-434v-x5qv-pmh6?
GHSA-434v-x5qv-pmh6 is classified under CWE-392: Missing Report of Error Condition (The product encounters an error but does not provide a status code or return value to indicate that an error has occurred.).
How can I check crates.io dependencies for GHSA-434v-x5qv-pmh6?
Run the dependency tree command: 'inspect dependencies for libcrux-ed25519'. 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-434v-x5qv-pmh6",
  "modified" : "2026-03-26T17:58:55Z",
  "published" : "2026-03-26T17:58:55Z",
  "aliases" : [ ],
  "summary" : "libcrux has All-Zero Key Generation Upon Catastrophic RNG Failure",
  "details" : "The libcrux-ed25519 key generation samples Ed25519 secret keys from a provided CSPRNG in a loop for up to 100 attempts until a non-zero key is found.  If a non-zero key could not be sampled within 100 attempts the key generation function would silently continue with an all-zero buffer as the secret key.\n\n## Impact\nThis bug only occurs in the event of a catastrophic failure of the CSPRNG, but would allow anyone to forge signatures under the resulting static signing key.\n\n## Mitigation\nInstead of silently continuing with an all-zero signing key, starting from version `0.0.7` key generation will error in the case of 100 failed attempts at sampling a valid key.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "libcrux-ed25519"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/cryspen/libcrux/pull/1349"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/cryspen/libcrux"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2026-0075.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1240", "CWE-331", "CWE-392" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-26T17:58:55Z",
    "nvd_published_at" : null
  }
}