Vulnerability-Lookup

CVE-2021-26813 (GCVE-0-2021-26813)

Vulnerability from cvelistv5 – Published: 2021-03-03 15:17 – Updated: 2024-08-03 20:33

Summary

markdown2 >=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.

Severity

7.5 (High)


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

CWE

Assigner

mitre mitre root

References

4 references

URL	Tags
https://github.com/trentm/python-markdown2/pull/387	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

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BREW-FAVA-CVE-2021-26813 (GHSA-JR9P-R423-9M2R)

Vulnerability from osv_homebrew – Published: 2026-08-13 16:46 – Updated: 2026-08-13 16:46 – Source website

Summary

markdown2 Regular Expression Denial of Service

Details

Severity

7.5 (High)


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

8.7 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

URL

Type

	https://nvd.nist.gov/vuln/detail/CVE-2021-26813	ADVISORY
	https://github.com/trentm/python-markdown2/pull/387	WEB
	https://github.com/trentm/python-markdown2/commit…	WEB
	https://github.com/advisories/GHSA-jr9p-r423-9m2r	ADVISORY
	https://github.com/pypa/advisory-database/tree/ma…	WEB
	https://github.com/trentm/python-markdown2	PACKAGE
	https://lists.fedoraproject.org/archives/list/pac…	WEB
	https://lists.fedoraproject.org/archives/list/pac…	WEB
	https://lists.fedoraproject.org/archives/list/pac…	WEB

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "resource": "markdown2",
        "resource_purl": "pkg:pypi/markdown2@2.5.5",
        "upstream_fixed_in": "2.4.0"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "fava",
        "purl": "pkg:brew/fava"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.30.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/markdown2@2.5.5",
        "name": "markdown2",
        "resource": "markdown2",
        "strategy": "registry",
        "subject_version": "2.5.5"
      },
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/markdown2@2.5.5",
        "name": "markdown2",
        "resource": "markdown2",
        "strategy": "registry",
        "subject_version": "2.5.5"
      }
    ]
  },
  "details": "markdown2 \u003e=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.",
  "id": "BREW-fava-CVE-2021-26813",
  "modified": "2026-08-13T16:46:31Z",
  "published": "2026-08-13T16:46:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-26813"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/pull/387"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/commit/7b651260739647de5198323e0445b1618750c374"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-jr9p-r423-9m2r"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2021-20.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/trentm/python-markdown2"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "markdown2 Regular Expression Denial of Service ",
  "upstream": [
    "GHSA-jr9p-r423-9m2r",
    "CVE-2021-26813",
    "PYSEC-2021-20"
  ]
}

BREW-LITERATE-GIT-CVE-20… (GHSA-JR9P-R423-9M2R)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:02 – Updated: 2026-09-17 19:14 – Source website

Summary

markdown2 Regular Expression Denial of Service

Details

Severity

7.5 (High)


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

8.7 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

URL

Type

	https://nvd.nist.gov/vuln/detail/CVE-2021-26813	ADVISORY
	https://github.com/trentm/python-markdown2/pull/387	WEB
	https://github.com/trentm/python-markdown2/commit…	WEB
	https://github.com/advisories/GHSA-jr9p-r423-9m2r	ADVISORY
	https://github.com/pypa/advisory-database/tree/ma…	WEB
	https://github.com/trentm/python-markdown2	PACKAGE
	https://lists.fedoraproject.org/archives/list/pac…	WEB
	https://lists.fedoraproject.org/archives/list/pac…	WEB
	https://lists.fedoraproject.org/archives/list/pac…	WEB

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "resource": "markdown2",
        "resource_purl": "pkg:pypi/markdown2@2.5.5",
        "upstream_fixed_in": "2.4.0"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "literate-git",
        "purl": "pkg:brew/literate-git"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.3.1"
            },
            {
              "fixed": "0.3.1_12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/markdown2@2.5.5",
        "name": "markdown2",
        "resource": "markdown2",
        "strategy": "registry",
        "subject_version": "2.5.5"
      }
    ]
  },
  "details": "markdown2 \u003e=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.",
  "id": "BREW-literate-git-CVE-2021-26813",
  "modified": "2026-09-17T19:14:18Z",
  "published": "2026-08-13T17:02:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-26813"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/pull/387"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/commit/7b651260739647de5198323e0445b1618750c374"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-jr9p-r423-9m2r"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2021-20.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/trentm/python-markdown2"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "markdown2 Regular Expression Denial of Service ",
  "upstream": [
    "GHSA-jr9p-r423-9m2r",
    "CVE-2021-26813",
    "PYSEC-2021-20"
  ]
}

BREW-SICKCHILL-CVE-2021-26813 (GHSA-JR9P-R423-9M2R)

Vulnerability from osv_homebrew – Published: 2026-08-13 17:34 – Updated: 2026-09-10 01:12 – Source website

Summary

markdown2 Regular Expression Denial of Service

Details

Severity

7.5 (High)


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

8.7 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

References

URL

Type

	https://nvd.nist.gov/vuln/detail/CVE-2021-26813	ADVISORY
	https://github.com/trentm/python-markdown2/pull/387	WEB
	https://github.com/trentm/python-markdown2/commit…	WEB
	https://github.com/advisories/GHSA-jr9p-r423-9m2r	ADVISORY
	https://github.com/pypa/advisory-database/tree/ma…	WEB
	https://github.com/trentm/python-markdown2	PACKAGE
	https://lists.fedoraproject.org/archives/list/pac…	WEB
	https://lists.fedoraproject.org/archives/list/pac…	WEB
	https://lists.fedoraproject.org/archives/list/pac…	WEB

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "resource": "markdown2",
        "resource_purl": "pkg:pypi/markdown2@2.5.5",
        "upstream_fixed_in": "2.4.0"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "sickchill",
        "purl": "pkg:brew/sickchill"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2024.3.1_7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/markdown2@2.5.5",
        "name": "markdown2",
        "resource": "markdown2",
        "strategy": "registry",
        "subject_version": "2.5.5"
      }
    ]
  },
  "details": "markdown2 \u003e=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.",
  "id": "BREW-sickchill-CVE-2021-26813",
  "modified": "2026-09-10T01:12:53Z",
  "published": "2026-08-13T17:34:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-26813"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/pull/387"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/commit/7b651260739647de5198323e0445b1618750c374"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-jr9p-r423-9m2r"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2021-20.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/trentm/python-markdown2"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "markdown2 Regular Expression Denial of Service ",
  "upstream": [
    "GHSA-jr9p-r423-9m2r",
    "CVE-2021-26813",
    "PYSEC-2021-20"
  ]
}

FKIE_CVE-2021-26813

Vulnerability from fkie_nvd - Published: 2021-03-03 16:15 - Updated: 2026-06-17 03:43

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

URL	Tags
cve@mitre.org	https://github.com/trentm/python-markdown2/pull/387	Exploit, Third Party Advisory
cve@mitre.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5/
cve@mitre.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH/
cve@mitre.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/
af854a3a-2127-422b-91ae-364da2661108	https://github.com/trentm/python-markdown2/pull/387	Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5/
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH/
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/

Impacted products

Vendor	Product	Version
markdown2_project	markdown2	*
fedoraproject	fedora	32
fedoraproject	fedora	33
fedoraproject	fedora	34

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:markdown2_project:markdown2:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D10B7C6C-D334-4D26-B76F-76078B95A8B3",
              "versionEndExcluding": "2.4.0",
              "versionStartIncluding": "1.0.1.18",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
              "matchCriteriaId": "36D96259-24BD-44E2-96D9-78CE1D41F956",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
              "matchCriteriaId": "E460AA51-FCDA-46B9-AE97-E6676AA5E194",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
              "matchCriteriaId": "A930E247-0B43-43CB-98FF-6CE7B8189835",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "markdown2 \u003e=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time."
    },
    {
      "lang": "es",
      "value": "markdown2 versiones anteriores a 1.0.1.18, corregido en 2.4.0, est\u00e1 afectado por una vulnerabilidad de denegaci\u00f3n de servicio de expresi\u00f3n regular.\u0026#xa0;Si un atacante proporciona una cadena maliciosa, puede dificultar el procesamiento de Markdown2 o retrasarlo durante un per\u00edodo de tiempo prolongado"
    }
  ],
  "id": "CVE-2021-26813",
  "lastModified": "2026-06-17T03:43:49.013",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-03-03T16:15:13.197",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/trentm/python-markdown2/pull/387"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5/"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH/"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/trentm/python-markdown2/pull/387"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1333"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-JR9P-R423-9M2R

Vulnerability from github – Published: 2021-06-02 21:44 – Updated: 2024-09-30 20:15

Summary

markdown2 Regular Expression Denial of Service

Details

Severity

7.5 (High)


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

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "markdown2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.1.18"
            },
            {
              "fixed": "2.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-26813"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-05-12T21:02:47Z",
    "nvd_published_at": "2021-03-03T16:15:00Z",
    "severity": "HIGH"
  },
  "details": "markdown2 \u003e=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.",
  "id": "GHSA-jr9p-r423-9m2r",
  "modified": "2024-09-30T20:15:06Z",
  "published": "2021-06-02T21:44:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-26813"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/pull/387"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/commit/7b651260739647de5198323e0445b1618750c374"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-jr9p-r423-9m2r"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2021-20.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/trentm/python-markdown2"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "markdown2 Regular Expression Denial of Service "
}

GSD-2021-26813

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

Aliases

CVE-2021-26813

Aliases

CVE-2021-26813

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-26813",
    "description": "markdown2 \u003e=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.",
    "id": "GSD-2021-26813",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-26813.html",
      "https://security.archlinux.org/CVE-2021-26813"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-26813"
      ],
      "details": "markdown2 \u003e=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.",
      "id": "GSD-2021-26813",
      "modified": "2023-12-13T01:23:33.285712Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2021-26813",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "n/a",
                    "version": {
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                        {
                          "version_value": "n/a"
                        }
                      ]
                    }
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              },
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            }
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      "references": {
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          },
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            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH/"
          },
          {
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            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5/"
          },
          {
            "name": "FEDORA-2021-e235a0da4a",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/"
          }
        ]
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003e=1.0.1.18,\u003c2.4.0",
          "affected_versions": "All versions starting from 1.0.1.18 before 2.4.0",
          "cvss_v2": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "cwe_ids": [
            "CWE-1035",
            "CWE-1333",
            "CWE-937"
          ],
          "date": "2023-08-08",
          "description": "markdown2 If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.",
          "fixed_versions": [
            "2.4.0"
          ],
          "identifier": "CVE-2021-26813",
          "identifiers": [
            "CVE-2021-26813"
          ],
          "not_impacted": "All versions before 1.0.1.18, all versions starting from 2.4.0",
          "package_slug": "pypi/markdown2",
          "pubdate": "2021-03-03",
          "solution": "Upgrade to version 2.4.0 or above.",
          "title": "Uncontrolled Resource Consumption",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2021-26813"
          ],
          "uuid": "d6aad26c-b76d-45d4-b116-ef6f374fc309"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:markdown2_project:markdown2:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "2.4.0",
                "versionStartIncluding": "1.0.1.18",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          },
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*",
                "cpe_name": [],
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2021-26813"
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        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "markdown2 \u003e=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "NVD-CWE-Other"
                }
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          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/trentm/python-markdown2/pull/387",
              "refsource": "MISC",
              "tags": [
                "Exploit",
                "Third Party Advisory"
              ],
              "url": "https://github.com/trentm/python-markdown2/pull/387"
            },
            {
              "name": "FEDORA-2021-0337384e41",
              "refsource": "FEDORA",
              "tags": [
                "Mailing List",
                "Third Party Advisory"
              ],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5/"
            },
            {
              "name": "FEDORA-2021-e235a0da4a",
              "refsource": "FEDORA",
              "tags": [
                "Mailing List",
                "Third Party Advisory"
              ],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/"
            },
            {
              "name": "FEDORA-2021-77191478ad",
              "refsource": "FEDORA",
              "tags": [
                "Mailing List",
                "Third Party Advisory"
              ],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH/"
            }
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        }
      },
      "impact": {
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          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2022-05-23T16:00Z",
      "publishedDate": "2021-03-03T16:15Z"
    }
  }
}

OPENSUSE-SU-2021:0429-1

Vulnerability from csaf_opensuse - Published: 2021-03-16 17:08 - Updated: 2021-03-16 17:08

Summary

Security update for python-markdown2

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-26813.

CVE-2021-26813

7.5 (High)


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

Recommended: 2 products

Open the full advisory

OPENSUSE-SU-2021:0451-1

Vulnerability from csaf_opensuse - Published: 2021-03-19 23:06 - Updated: 2021-03-19 23:06

Summary

Security update for python-markdown2

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-26813.

CVE-2021-26813

7.5 (High)


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

Recommended: 2 products

Open the full advisory

OPENSUSE-SU-2024:11237-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2024-06-15 00:00

Summary

python36-markdown2-2.4.0-2.4 on GA media

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2021-26813.

CVE-2021-26813

7.5 (High)


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

Recommended: 12 products

Open the full advisory

OPENSUSE-SU-2024:14146-1

Vulnerability from csaf_opensuse - Published: 2024-07-12 00:00 - Updated: 2024-07-12 00:00

Summary

python310-markdown2-2.4.13-1.2 on GA media

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2021-26813.

CVE-2021-26813

7.5 (High)


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

Recommended: 12 products

Open the full advisory

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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-26813 (GCVE-0-2021-26813)

BREW-FAVA-CVE-2021-26813 (GHSA-JR9P-R423-9M2R)

BREW-LITERATE-GIT-CVE-20… (GHSA-JR9P-R423-9M2R)

BREW-SICKCHILL-CVE-2021-26813 (GHSA-JR9P-R423-9M2R)

FKIE_CVE-2021-26813

GHSA-JR9P-R423-9M2R

GSD-2021-26813

OPENSUSE-SU-2021:0429-1

OPENSUSE-SU-2021:0451-1

OPENSUSE-SU-2024:11237-1

OPENSUSE-SU-2024:14146-1

Tags

Sightings

Nomenclature

Related by attack behaviour