MediumFix available
cmark-gfm, ghostwriter and 3 more products — security advisory
cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior to 0.29.0.gfm.6 a polynomial time complexity issue in cmark-gfm's autolink extension may lead to unbounded resource exhaustion and subsequent denial of service. Users may verify the patch by running `python3 -c 'print("![l"* 100000 + "\n")' | ./cmark-gfm -e autolink`, which will resource exhaust on unpatched cmark-gfm but render correctly on patched cmark-gfm. This vulnerability has been patched in 0.29.0.gfm.6. Users are advised to upgrade. Users unable to upgrade should disable the use of the autolink extension.
- Products
- cmark-gfm, ghostwriter, python-cmarkgfm, r-cran-commonmark, ruby-commonmarker
- Affected versions
- 0.23.10-1, 0.23.6-1, 0.23.9-1, 0.8.0-3, 2.10.0-1, 2.10.0-2, 2.8.3-1, 2.8.3-2, 2.8.3-3, 2.8.3-4, 2024.11.20-1, 2025.10.22-1, 2025.10.22-2
- Fixed versions
- 0.23.10-1, 0.29.0.gfm.6-2, 1.8.1-1, 2.1.6+ds-1, 2024.11.20-1
- CVEs
- CVE-2022-39209
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 14:58 UTC · Revision 1
Source evidence
cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior to 0.29.0.gfm.6 a polynomial time complexity issue in cmark-gfm's autolink extension may lead to unbounded resource exhaustion and subsequent denial of service. Users may verify the patch by running `python3 -c 'print("![l"* 100000 + "\n")' | ./cmark-gfm -e autolink`, which will resource exhaust on unpatched cmark-gfm but render correctly on patched cmark-gfm. This vulnerability has been patched in 0.29.0.gfm.6. Users are advised to upgrade. Users unable to upgrade should disable the use of the autolink extension.
osv:DEBIAN-CVE-2022-39209
cmark-gfm
Fixed versions: 0.29.0.gfm.6-2
cmark-gfm
Fixed versions: 0.29.0.gfm.6-2
cmark-gfm
Fixed versions: 0.29.0.gfm.6-2
ghostwriter
Fixed versions: 2.1.6+ds-1
ghostwriter
Fixed versions: 2.1.6+ds-1
ghostwriter
Fixed versions: 2.1.6+ds-1
python-cmarkgfm
Fixed versions: Not specified
python-cmarkgfm
Fixed versions: 2024.11.20-1
python-cmarkgfm
Fixed versions: 2024.11.20-1
r-cran-commonmark
Fixed versions: 1.8.1-1
r-cran-commonmark
Fixed versions: 1.8.1-1
r-cran-commonmark
Fixed versions: 1.8.1-1
ruby-commonmarker
Fixed versions: Not specified
ruby-commonmarker
Fixed versions: 0.23.10-1
ruby-commonmarker
Fixed versions: 0.23.10-1
Complete source record
{
"id": "f65cb91e3f727dd1df49d03484680af1333ecfb16826d1db3126bd99f4c6cbf5",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2022-39209",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2022-39209",
"summary": "cmark-gfm is GitHub's fork of cmark, a CommonMark parsing and rendering library and program in C. In versions prior to 0.29.0.gfm.6 a polynomial time complexity issue in cmark-gfm's autolink extension may lead to unbounded resource exhaustion and subsequent denial of service. Users may verify the patch by running `python3 -c 'print(\"![l\"* 100000 + \"\\n\")' | ./cmark-gfm -e autolink`, which will resource exhaust on unpatched cmark-gfm but render correctly on patched cmark-gfm. This vulnerability has been patched in 0.29.0.gfm.6. Users are advised to upgrade. Users unable to upgrade should disable the use of the autolink extension.",
"evidence": "osv:DEBIAN-CVE-2022-39209",
"products": [
{
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"evidence": "/affected/0/package/name"
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"evidence": "/affected/0/ranges"
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{
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{
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{
"name": {
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{
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{
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"affected_versions": [
{
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{
"value": "2024.11.20-1",
"evidence": "/affected/6/versions"
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{
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"evidence": "/affected/6/versions"
},
{
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{
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{
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],
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{
"name": {
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"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.8.1-1",
"evidence": "/affected/9/ranges"
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"affected_versions": []
},
{
"name": {
"value": "r-cran-commonmark",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/10/ranges"
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],
"affected_versions": []
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{
"name": {
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"evidence": "/affected/11/package/name"
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"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.23.10-1",
"evidence": "/affected/12/versions"
},
{
"value": "0.23.6-1",
"evidence": "/affected/12/versions"
},
{
"value": "0.23.9-1",
"evidence": "/affected/12/versions"
},
{
"value": "2.10.0-1",
"evidence": "/affected/12/versions"
},
{
"value": "2.10.0-2",
"evidence": "/affected/12/versions"
},
{
"value": "2.8.3-1",
"evidence": "/affected/12/versions"
},
{
"value": "2.8.3-2",
"evidence": "/affected/12/versions"
},
{
"value": "2.8.3-3",
"evidence": "/affected/12/versions"
},
{
"value": "2.8.3-4",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "ruby-commonmarker",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.23.10-1",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "ruby-commonmarker",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.23.10-1",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2022-39209",
"aliases": [
"DEBIAN-CVE-2022-39209"
],
"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": [
{
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},
{
"fixed": "0.29.0.gfm.6-2"
}
]
}
],
"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-2022-39209.json"
},
"ecosystem_specific": {
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}
},
{
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}
],
"package": {
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"purl": "pkg:deb/debian/cmark-gfm?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
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},
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}
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],
"package": {
"name": "ghostwriter",
"purl": "pkg:deb/debian/ghostwriter?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-39209.json"
},
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}
},
{
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],
"package": {
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"purl": "pkg:deb/debian/ghostwriter?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-39209.json"
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"package": {
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"purl": "pkg:deb/debian/python-cmarkgfm?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
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"2024.11.20-1",
"2025.10.22-1",
"2025.10.22-2"
],
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"package": {
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{
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],
"package": {
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"ecosystem": "Debian:12"
},
"database_specific": {
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},
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],
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},
"database_specific": {
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},
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{
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],
"package": {
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}
},
{
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{
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}
],
"package": {
"name": "ruby-commonmarker",
"purl": "pkg:deb/debian/ruby-commonmarker?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"2.10.0-1",
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"2.8.3-2",
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"2.8.3-4"
],
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},
{
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],
"package": {
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},
"ecosystem_specific": {
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},
{
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{
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],
"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-2022-39209.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-15T08:02:41.386234482Z",
"provider": "osv",
"upstream": [
"CVE-2022-39209"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2022-39209"
]
},
"related_cves": [
{
"value": "CVE-2022-39209",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 323974,
"published_at": "2022-09-15T18:15:12.26+00:00"
}