Security advisory

{
  "id": "efef2d18422178250aac378894c346ba852bd5251ed43a94440f59375cd92e5f",
  "url": "https://osv.dev/vulnerability/CVE-2021-46872",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-46872",
    "summary": "An issue was discovered in Nim before 1.6.2. The RST module of the Nim language stdlib, as used in NimForum and other products, permits the javascript: URI scheme and thus can lead to XSS in some applications. (Nim versions 1.6.2 and later are fixed; there may be backports of the fix to some earlier versions. NimForum 2.2.0 is fixed.)",
    "evidence": "osv:CVE-2021-46872",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-46872",
      "aliases": [
        "CVE-2021-46872"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nim-lang/nim",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "9084d9bc02bcd983b81a4c76a05f27b9ce2707dd"
                },
                {
                  "fixed": "46275126b89218e64844eee169e8ced05dd0e2d7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nim-lang:nim:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.6.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "46275126b89218e64844eee169e8ced05dd0e2d7"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.6.0",
            "v1.0.0",
            "v0.20.0",
            "v0.19.0",
            "v0.18.0",
            "v0.17.2",
            "v0.17.0",
            "v0.16.0",
            "v0.15.2",
            "v0.14.2",
            "v0.15.0",
            "v0.14.0",
            "v0.13.0",
            "v0.12.0",
            "v0.11.2",
            "v0.11.0",
            "v0.10.2",
            "v0.9.4",
            "v0.9.2",
            "v0.9.0",
            "v0.8.14"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-46872.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/nim-lang/nimforum",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "26a3bb993c186d5a5c4c2464aa2c13a0cba9ef4c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nim-lang:nimforum:*:*:*:*:*:nim:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.2.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.1.0",
            "v2.0.1",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-46872.json"
          }
        }
      ],
      "modified": "2026-10-24T10:50:43.838318702Z",
      "provider": "osv",
      "references": [
        "https://github.com/nim-lang/Nim/compare/v1.6.0...v1.6.2",
        "https://github.com/nim-lang/nimforum",
        "https://forum.nim-lang.org/t/8852",
        "https://github.com/nim-lang/Nim/commit/46275126b89218e64844eee169e8ced05dd0e2d7",
        "https://github.com/nim-lang/Nim/pull/19134"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-46872",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 442534,
  "published_at": "2023-01-13T06:15:10.94+00:00"
}