Security advisory

{
  "id": "7a16a0e93aee3036145fea7d5ee61969e3b6b4dce6cf86282cd3f60d57e74df5",
  "url": "https://osv.dev/vulnerability/CVE-2020-5238",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-5238",
    "summary": "The table extension in GitHub Flavored Markdown before version 0.29.0.gfm.1 takes O(n * n) time to parse certain inputs. An attacker could craft a markdown table which would take an unreasonably long time to process, causing a denial of service. This issue does not affect the upstream cmark project. The issue has been fixed in version 0.29.0.gfm.1.",
    "evidence": "osv:CVE-2020-5238",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-5238",
      "aliases": [
        "CVE-2020-5238",
        "GHSA-7gc6-9qr5-hc85"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/github/cmark-gfm",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0f98e8abfb65dd7b2a2ae03e46b182b5124e0e34"
                },
                {
                  "fixed": "85d895289c5ab67f988ca659493a64abb5fec7b4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:github_flavored_markdown_project:github_flavored_markdown:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.29.0.gfm.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "85d895289c5ab67f988ca659493a64abb5fec7b4"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.28.3.gfm.20",
            "0.29.0.gfm.0",
            "0.28.3.gfm.19",
            "0.28.3.gfm.18",
            "0.28.3.gfm.17",
            "0.28.3.gfm.16",
            "0.28.3.gfm.15",
            "0.28.3.gfm.14",
            "0.28.3.gfm.13",
            "0.28.3.gfm.12",
            "0.28.0.gfm.11",
            "0.28.0.gfm.10",
            "0.28.0.gfm.9",
            "0.28.0.gfm.8",
            "0.28.0.gfm.7",
            "0.28.0.gfm.6",
            "0.28.0.gfm.5",
            "0.27.1.gfm.4",
            "0.27.1.gfm.3",
            "0.27.1.gfm.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-5238.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:22.478999037Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TCDHBTUFIOYRIS5HAS6PZNBNMB7IOAX3/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WMQFOQQCWOAMQ4I2XIVCVOXXIJ75HDCW/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGJH2A4VAV54X6NSCNNGSEIGIIY5N2VR/",
        "https://github.com/github/cmark-gfm/security/advisories/GHSA-7gc6-9qr5-hc85",
        "https://github.com/github/cmark-gfm/commit/85d895289c5ab67f988ca659493a64abb5fec7b4"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "31"
                  },
                  {
                    "last_affected": "31"
                  },
                  {
                    "introduced": "32"
                  },
                  {
                    "last_affected": "32"
                  },
                  {
                    "introduced": "33"
                  },
                  {
                    "last_affected": "33"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-5238",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385232,
  "published_at": "2020-07-01T23:15:10.443+00:00"
}