Security advisory

{
  "id": "8cbe1668cb7667e045e844d0c95ba7b5dead8227a723eadc6193a46cc374359a",
  "url": "https://osv.dev/vulnerability/CVE-2021-41117",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-41117",
    "summary": "keypair is a a RSA PEM key generator written in javascript. keypair implements a lot of cryptographic primitives on its own or by borrowing from other libraries where possible, including node-forge. An issue was discovered where this library was generating identical RSA keys used in SSH. This would mean that the library is generating identical P, Q (and thus N) values which, in practical terms, is impossible with RSA-2048 keys. Generating identical values, repeatedly, usually indicates an issue with poor random number generation, or, poor handling of CSPRNG output. Issue 1: Poor random number generation (`GHSL-2021-1012`). The library does not rely entirely on a platform provided CSPRNG, rather, it uses it's own counter-based CMAC approach. Where things go wrong is seeding the CMAC implementation with \"true\" random data in the function `defaultSeedFile`. In order to seed the AES-CMAC generator, the library will take two different approaches depending on the JavaScript execution environment. In a browser, the library will use [`window.crypto.getRandomValues()`](https://github.com/juliangruber/keypair/blob/87c62f255baa12c1ec4f98a91600f82af80be6db/index.js#L971). However, in a nodeJS execution environment, the `window` object is not defined, so it goes down a much less secure solution, also of which has a bug in it. It does look like the library tries to use node's CSPRNG when possible unfortunately, it looks like the `crypto` object is null because a variable was declared with ",
    "evidence": "osv:CVE-2021-41117",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2021-41117",
      "aliases": [
        "CVE-2021-41117",
        "GHSA-3f99-hvg4-qjwj"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/juliangruber/keypair",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "65f9f24c561c73e37b408310d6c07ee50af0f575"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:keypair_project:keypair:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.0.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "1.0.0",
            "0.0.5",
            "0.0.4",
            "0.0.3",
            "0.0.2",
            "0.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41117.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:57.863738427Z",
      "provider": "osv",
      "references": [
        "https://github.com/juliangruber/keypair/security/advisories/GHSA-3f99-hvg4-qjwj",
        "https://securitylab.github.com/advisories/GHSL-2021-1012-keypair/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-41117",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386567,
  "published_at": "2021-10-11T17:15:07.973+00:00"
}