MediumFix available
cmark-gfm, haskell-cmark-gfm and 3 more products — security advisory
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.
- Products
- cmark-gfm, haskell-cmark-gfm, python-cmarkgfm, r-cran-commonmark, ruby-commonmarker
- Affected versions
- Not specified
- Fixed versions
- 0.2.1+ds1-1, 0.21.0-1, 0.29.0.gfm.2-1, 0.7.0-1, 1.8.0-1
- CVEs
- CVE-2020-5238
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 14:07 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2020-5238
cmark-gfm
Fixed versions: 0.29.0.gfm.2-1
cmark-gfm
Fixed versions: 0.29.0.gfm.2-1
cmark-gfm
Fixed versions: 0.29.0.gfm.2-1
haskell-cmark-gfm
Fixed versions: 0.2.1+ds1-1
haskell-cmark-gfm
Fixed versions: 0.2.1+ds1-1
haskell-cmark-gfm
Fixed versions: 0.2.1+ds1-1
python-cmarkgfm
Fixed versions: 0.7.0-1
python-cmarkgfm
Fixed versions: 0.7.0-1
python-cmarkgfm
Fixed versions: 0.7.0-1
r-cran-commonmark
Fixed versions: 1.8.0-1
r-cran-commonmark
Fixed versions: 1.8.0-1
r-cran-commonmark
Fixed versions: 1.8.0-1
ruby-commonmarker
Fixed versions: 0.21.0-1
ruby-commonmarker
Fixed versions: 0.21.0-1
ruby-commonmarker
Fixed versions: 0.21.0-1
Complete source record
{
"id": "fdd2f36e7238efb896ab4e2d53dc4a65ebdbd74333102db842e435c3af002359",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-5238",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-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:DEBIAN-CVE-2020-5238",
"products": [
{
"name": {
"value": "cmark-gfm",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.29.0.gfm.2-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "cmark-gfm",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.29.0.gfm.2-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "cmark-gfm",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.29.0.gfm.2-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "haskell-cmark-gfm",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.2.1+ds1-1",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "haskell-cmark-gfm",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.2.1+ds1-1",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "haskell-cmark-gfm",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.2.1+ds1-1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-cmarkgfm",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7.0-1",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-cmarkgfm",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7.0-1",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-cmarkgfm",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7.0-1",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "r-cran-commonmark",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.8.0-1",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "r-cran-commonmark",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.8.0-1",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "r-cran-commonmark",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.8.0-1",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-commonmarker",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.21.0-1",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-commonmarker",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.21.0-1",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-commonmarker",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.21.0-1",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2020-5238",
"aliases": [
"DEBIAN-CVE-2020-5238"
],
"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": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.29.0.gfm.2-1"
}
]
}
],
"package": {
"name": "cmark-gfm",
"purl": "pkg:deb/debian/cmark-gfm?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.29.0.gfm.2-1"
}
]
}
],
"package": {
"name": "cmark-gfm",
"purl": "pkg:deb/debian/cmark-gfm?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.29.0.gfm.2-1"
}
]
}
],
"package": {
"name": "cmark-gfm",
"purl": "pkg:deb/debian/cmark-gfm?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.2.1+ds1-1"
}
]
}
],
"package": {
"name": "haskell-cmark-gfm",
"purl": "pkg:deb/debian/haskell-cmark-gfm?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.2.1+ds1-1"
}
]
}
],
"package": {
"name": "haskell-cmark-gfm",
"purl": "pkg:deb/debian/haskell-cmark-gfm?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.2.1+ds1-1"
}
]
}
],
"package": {
"name": "haskell-cmark-gfm",
"purl": "pkg:deb/debian/haskell-cmark-gfm?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7.0-1"
}
]
}
],
"package": {
"name": "python-cmarkgfm",
"purl": "pkg:deb/debian/python-cmarkgfm?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7.0-1"
}
]
}
],
"package": {
"name": "python-cmarkgfm",
"purl": "pkg:deb/debian/python-cmarkgfm?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7.0-1"
}
]
}
],
"package": {
"name": "python-cmarkgfm",
"purl": "pkg:deb/debian/python-cmarkgfm?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.8.0-1"
}
]
}
],
"package": {
"name": "r-cran-commonmark",
"purl": "pkg:deb/debian/r-cran-commonmark?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.8.0-1"
}
]
}
],
"package": {
"name": "r-cran-commonmark",
"purl": "pkg:deb/debian/r-cran-commonmark?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.8.0-1"
}
]
}
],
"package": {
"name": "r-cran-commonmark",
"purl": "pkg:deb/debian/r-cran-commonmark?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.21.0-1"
}
]
}
],
"package": {
"name": "ruby-commonmarker",
"purl": "pkg:deb/debian/ruby-commonmarker?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.21.0-1"
}
]
}
],
"package": {
"name": "ruby-commonmarker",
"purl": "pkg:deb/debian/ruby-commonmarker?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.21.0-1"
}
]
}
],
"package": {
"name": "ruby-commonmarker",
"purl": "pkg:deb/debian/ruby-commonmarker?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-5238.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T12:02:50.791309679Z",
"provider": "osv",
"upstream": [
"CVE-2020-5238"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2020-5238"
]
},
"related_cves": [
{
"value": "CVE-2020-5238",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 453157,
"published_at": "2020-07-01T23:15:10.443+00:00"
}