Crypt::DSA versions before 1.22 for Perl draw the DSA signing nonce and private key from a biased random generator, leading to private-key recovery

{
  "id": "83fe6419b084e10928c4d06125275c4eadca85a6cb3ef353e7a7f9ca976e1c65",
  "url": "https://osv.dev/vulnerability/CVE-2026-14570",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Crypt::DSA versions before 1.22 for Perl draw the DSA signing nonce and private key from a biased random generator, leading to private-key recovery",
    "summary": "Crypt::DSA versions before 1.22 for Perl draw the DSA signing nonce and private key from a biased random generator, leading to private-key recovery. \"Crypt::DSA::Util::makerandom forces the high bit of every value it returns to obtain an exactly N-bit integer for prime search. The signing nonce and the private key are drawn from makerandom. Because the high bit is always set, the result is not uniform: its top bit is fixed, producing insecure values.\" An attacker who collects a modest number of signatures under an affected key, together with the public key, can recover the private key with a lattice attack. Keys used to sign with an affected version should be considered compromised and new keys should be generated.",
    "evidence": "osv:CVE-2026-14570",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-14570",
      "aliases": [
        "CVE-2026-14570"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/perl-crypt-openpgp/crypt-dsa",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "38e17c7bf063b6a499084fbe477efbf788df8ecc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.22"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.21",
            "1.20",
            "1.19",
            "1.18",
            "1.17"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-14570.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.943665116Z",
      "provider": "osv",
      "references": [
        "https://cpan.org/modules",
        "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.21/source/lib/Crypt/DSA/Util.pm#L56",
        "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/diff/TIMLEGGE/Crypt-DSA-1.21#lib/Crypt/DSA/Util.pm",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/14xxx/CVE-2026-14570.json",
        "https://metacpan.org/release/TIMLEGGE/Crypt-DSA-1.22/changes",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-14570",
        "https://github.com/perl-Crypt-OpenPGP/Crypt-DSA"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-330"
        ],
        "cna_assigner": "CPANSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/14xxx/CVE-2026-14570.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-14570",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 503459,
  "published_at": "2026-07-05T01:30:12.849+00:00"
}