Vulnerability-Lookup

OESA-2021-1175 (CVE-2020-26298)

Vulnerability from osv_openeuler – Published: 2021-05-06 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

rubygem-redcarpet security update

Details

A fast, safe and extensible Markdown to (X)HTML parser.

Security Fix(es):

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.(CVE-2020-26298)

Severity

5.4 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-26298	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "rubygem-redcarpet-debuginfo-3.5.1-1.oe1.aarch64.rpm",
          "rubygem-redcarpet-debugsource-3.5.1-1.oe1.aarch64.rpm",
          "rubygem-redcarpet-3.5.1-1.oe1.aarch64.rpm"
        ],
        "noarch": [
          "rubygem-redcarpet-doc-3.5.1-1.oe1.noarch.rpm"
        ],
        "src": [
          "rubygem-redcarpet-3.5.1-1.oe1.src.rpm"
        ],
        "x86_64": [
          "rubygem-redcarpet-debugsource-3.5.1-1.oe1.x86_64.rpm",
          "rubygem-redcarpet-3.5.1-1.oe1.x86_64.rpm",
          "rubygem-redcarpet-debuginfo-3.5.1-1.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "rubygem-redcarpet",
        "purl": "pkg:rpm/openEuler/rubygem-redcarpet\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.5.1-1.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "A fast, safe and extensible Markdown to (X)HTML parser.\r\n\r\nSecurity Fix(es):\r\n\r\nRedcarpet 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.(CVE-2020-26298)",
  "id": "OESA-2021-1175",
  "modified": "2026-08-06T11:04:24Z",
  "published": "2021-05-06T11:04:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1175"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-26298"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rubygem-redcarpet security update",
  "upstream": [
    "CVE-2020-26298"
  ]
}

CVE-2020-26298 (GCVE-0-2020-26298)

Vulnerability from cvelistv5 – Published: 2021-01-11 00:00 – Updated: 2025-02-13 16:27

Title

Injection in Redcarpet

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.

Severity

6.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N

CWE

CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-79 - Cross-site Scripting (XSS)

Assigner

GitHub_M mitre root

References

9 references

URL	Tags
https://github.com/advisories/GHSA-q3wr-qw3g-3p4h
https://github.com/vmg/redcarpet/commit/a699c8229…
https://rubygems.org/gems/redcarpet
https://github.com/vmg/redcarpet/blob/master/CHAN…
https://lists.debian.org/debian-lts-announce/2021…	mailing-list
https://www.debian.org/security/2021/dsa-4831	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
vmg	redcarpet	Affected: < 3.5.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T15:56:04.533Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
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            ],
            "url": "https://github.com/advisories/GHSA-q3wr-qw3g-3p4h"
          },
          {
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              "x_transferred"
            ],
            "url": "https://github.com/vmg/redcarpet/commit/a699c82292b17c8e6a62e1914d5eccc252272793"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://rubygems.org/gems/redcarpet"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/vmg/redcarpet/blob/master/CHANGELOG.md#version-351-security"
          },
          {
            "name": "[debian-lts-announce] 20210115 [SECURITY] [DLA 2526-1] ruby-redcarpet security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2021/01/msg00014.html"
          },
          {
            "name": "DSA-4831",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2021/dsa-4831"
          },
          {
            "name": "FEDORA-2023-597f13ffb9",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FNO4ZZUPGAEUXKQL4G2HRIH7CUZKPCT6/"
          },
          {
            "name": "FEDORA-2023-8682a0e17d",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFMYDIONVWATY7EB6EARDVXT47AYCRNM/"
          },
          {
            "name": "FEDORA-2023-44daa9c1d4",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXNNWHHAPREDM3XJDACYRTK7DBMUONBI/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "redcarpet",
          "vendor": "vmg",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.5.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-74",
              "description": "CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component (\u0027Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79 Cross-site Scripting (XSS)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-05-09T02:06:17.173Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "url": "https://github.com/advisories/GHSA-q3wr-qw3g-3p4h"
        },
        {
          "url": "https://github.com/vmg/redcarpet/commit/a699c82292b17c8e6a62e1914d5eccc252272793"
        },
        {
          "url": "https://rubygems.org/gems/redcarpet"
        },
        {
          "url": "https://github.com/vmg/redcarpet/blob/master/CHANGELOG.md#version-351-security"
        },
        {
          "name": "[debian-lts-announce] 20210115 [SECURITY] [DLA 2526-1] ruby-redcarpet security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2021/01/msg00014.html"
        },
        {
          "name": "DSA-4831",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2021/dsa-4831"
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        {
          "name": "FEDORA-2023-597f13ffb9",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FNO4ZZUPGAEUXKQL4G2HRIH7CUZKPCT6/"
        },
        {
          "name": "FEDORA-2023-8682a0e17d",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFMYDIONVWATY7EB6EARDVXT47AYCRNM/"
        },
        {
          "name": "FEDORA-2023-44daa9c1d4",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXNNWHHAPREDM3XJDACYRTK7DBMUONBI/"
        }
      ],
      "source": {
        "advisory": "GHSA-q3wr-qw3g-3p4h",
        "discovery": "UNKNOWN"
      },
      "title": "Injection in Redcarpet",
      "x_generator": {
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    }
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  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2020-26298",
    "datePublished": "2021-01-11T00:00:00.000Z",
    "dateReserved": "2020-10-01T00:00:00.000Z",
    "dateUpdated": "2025-02-13T16:27:42.195Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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OESA-2021-1175 (CVE-2020-26298)

CVE-2020-26298 (GCVE-0-2020-26298)

Tags

Sightings

Nomenclature

Related by attack behaviour