Security advisory

{
  "id": "31ac9cd4f0368f1de533a207dceac83467ecc6fb97d98d1b60c21faa5a69f0e0",
  "url": "https://osv.dev/vulnerability/CVE-2021-37588",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-37588",
    "summary": "In Charm 0.43, any two users can collude to achieve the ability to decrypt YCT14 data.",
    "evidence": "osv:CVE-2021-37588",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-37588",
      "aliases": [
        "CVE-2021-37588"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/jhuisi/charm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "42e38b121edce8d9dad111a6ac919b420f6b1482"
                },
                {
                  "last_affected": "42e38b121edce8d9dad111a6ac919b420f6b1482"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:jhu:charm:0.43:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.43"
                      },
                      {
                        "last_affected": "0.43"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.43",
            "v0.43"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-37588.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:51.641381641Z",
      "provider": "osv",
      "references": [
        "https://eprint.iacr.org/2020/460",
        "https://github.com/JHUISI/charm/blob/dev/charm/schemes/abenc/abenc_yct14.py",
        "https://www2.hci.uni-hannover.de/papers/Tan2019.pdf",
        "https://github.com/JHUISI/charm/issues/276"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-37588",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384702,
  "published_at": "2021-07-30T14:15:18.577+00:00"
}