Security advisory

{
  "id": "6eb736697db4c8aa3bc9cc41339bb890bd89f750a927cfcb2244d29b34e968f7",
  "url": "https://osv.dev/vulnerability/CVE-2020-26298",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-26298",
    "summary": "Redcarpet is a Ruby library for Markdown processing. In Redcarpet before version 3.5.1, there is an injection vulnerability which can enable a cross-site scripting attack. In affected versions no HTML escaping was being performed when processing quotes. This applies even when the `:escape_html` option was being used. This is fixed in version 3.5.1 by the referenced commit.",
    "evidence": "osv:CVE-2020-26298",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-26298",
      "aliases": [
        "CVE-2020-26298",
        "GHSA-q3wr-qw3g-3p4h"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/vmg/redcarpet",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "a699c82292b17c8e6a62e1914d5eccc252272793"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:redcarpet_project:redcarpet:*:*:*:*:*:ruby:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.5.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a699c82292b17c8e6a62e1914d5eccc252272793"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.5.0",
            "v3.4.0",
            "v3.3.4",
            "v3.3.3",
            "v3.3.1",
            "v3.3.2",
            "v3.3.0",
            "v3.2.0",
            "v3.1.1",
            "v3.0.0",
            "v2.2.2",
            "v2.2.1",
            "v2.2.0",
            "v2.1.1",
            "v2.1.0",
            "v2.0.1",
            "v2.0.0",
            "v1.17.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26298.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-26298-bc2a74b8",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "198197667677715849428623281048180277561",
                    "54830763969004594676731107425085190938",
                    "97811103998125843691871254455650728211",
                    "139603207368515949909553120480638757958",
                    "313289017949240420953274720090354965485"
                  ]
                },
                "source": "https://github.com/vmg/redcarpet/commit/a699c82292b17c8e6a62e1914d5eccc252272793",
                "target": {
                  "file": "ext/redcarpet/html.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-26298-ccd1bdea",
                "digest": {
                  "length": 249,
                  "function_hash": "244524669993411248594301671481377802264"
                },
                "source": "https://github.com/vmg/redcarpet/commit/a699c82292b17c8e6a62e1914d5eccc252272793",
                "target": {
                  "file": "ext/redcarpet/html.c",
                  "function": "rndr_quote"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:05:17Z"
          }
        }
      ],
      "modified": "2026-10-20T14:05:17.533346145Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFMYDIONVWATY7EB6EARDVXT47AYCRNM/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FNO4ZZUPGAEUXKQL4G2HRIH7CUZKPCT6/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXNNWHHAPREDM3XJDACYRTK7DBMUONBI/",
        "https://github.com/advisories/GHSA-q3wr-qw3g-3p4h",
        "https://github.com/vmg/redcarpet/blob/master/CHANGELOG.md#version-351-security",
        "https://lists.debian.org/debian-lts-announce/2021/01/msg00014.html",
        "https://rubygems.org/gems/redcarpet",
        "https://www.debian.org/security/2021/dsa-4831",
        "https://github.com/vmg/redcarpet/commit/a699c82292b17c8e6a62e1914d5eccc252272793"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  },
                  {
                    "introduced": "10.0"
                  },
                  {
                    "last_affected": "10.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-26298",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388549,
  "published_at": "2021-01-11T19:15:13.133+00:00"
}