HighFix available
python3.11, python3.13 and 1 more products — security advisory
The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.
- Products
- python3.11, python3.13, python3.14
- Affected versions
- 3.11.2-6, 3.11.2-6+deb12u1, 3.11.2-6+deb12u2, 3.11.2-6+deb12u3, 3.11.2-6+deb12u4, 3.11.2-6+deb12u5, 3.11.2-6+deb12u6, 3.11.2-6+deb12u7, 3.11.2-6+deb12u8, 3.13.11-1, 3.13.12-1, 3.13.14-1, 3.13.15-1, 3.13.5-2, 3.13.5-2+deb13u1, 3.13.5-2+deb13u2, 3.13.5-2+deb13u3, 3.13.5-2+deb13u4, 3.13.5-2+deb13u5, 3.13.6-1, 3.13.7-1, 3.13.8-1, 3.13.9-1, 3.14.0-1, 3.14.0-2, 3.14.0-3, 3.14.0-4, 3.14.0-5, 3.14.0~a7-1, 3.14.0~b1-1, 3.14.0~b2-1, 3.14.0~b3-1, 3.14.0~b4-1, 3.14.0~rc1-1, 3.14.0~rc2-1, 3.14.0~rc3-1, 3.14.2-1, 3.14.3-1, 3.14.3-2, 3.14.3-3, 3.14.3-4, 3.14.3-5, 3.14.4-1, 3.14.4-2, 3.14.5-1, 3.14.5~rc1-1, 3.14.6-1
- Fixed versions
- 3.11.2-6+deb12u9, 3.13.15-1, 3.14.7-1
- CVEs
- CVE-2026-15308
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 09:02 UTC · Revision 1
Source evidence
The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.
osv:DEBIAN-CVE-2026-15308
python3.11
Fixed versions: 3.11.2-6+deb12u9
python3.13
Fixed versions: Not specified
python3.13
Fixed versions: 3.13.15-1
python3.14
Fixed versions: 3.14.7-1
Complete source record
{
"id": "f59458f16e8d86d9abda4f40792a2855e4ebca176881e8e8ea0e6949431a50f0",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-15308",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-15308",
"summary": "The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.",
"evidence": "osv:DEBIAN-CVE-2026-15308",
"products": [
{
"name": {
"value": "python3.11",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.2-6+deb12u9",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "3.11.2-6",
"evidence": "/affected/0/versions"
},
{
"value": "3.11.2-6+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.11.2-6+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.11.2-6+deb12u3",
"evidence": "/affected/0/versions"
},
{
"value": "3.11.2-6+deb12u4",
"evidence": "/affected/0/versions"
},
{
"value": "3.11.2-6+deb12u5",
"evidence": "/affected/0/versions"
},
{
"value": "3.11.2-6+deb12u6",
"evidence": "/affected/0/versions"
},
{
"value": "3.11.2-6+deb12u7",
"evidence": "/affected/0/versions"
},
{
"value": "3.11.2-6+deb12u8",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "python3.13",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.13.11-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.12-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.14-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.15-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.5-2",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.5-2+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.5-2+deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.5-2+deb13u3",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.5-2+deb13u4",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.5-2+deb13u5",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.6-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.7-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.8-1",
"evidence": "/affected/1/versions"
},
{
"value": "3.13.9-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "python3.13",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.13.15-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "3.13.11-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.13.12-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.13.14-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.13.5-2",
"evidence": "/affected/2/versions"
},
{
"value": "3.13.6-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.13.7-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.13.8-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.13.9-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "python3.14",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.14.7-1",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": [
{
"value": "3.14.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0-2",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0-3",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0-4",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0-5",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0~a7-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0~b1-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0~b2-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0~b3-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0~b4-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0~rc1-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0~rc2-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.0~rc3-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.2-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.3-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.3-2",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.3-3",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.3-4",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.3-5",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.4-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.4-2",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.5-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.5~rc1-1",
"evidence": "/affected/3/versions"
},
{
"value": "3.14.6-1",
"evidence": "/affected/3/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-15308",
"aliases": [
"DEBIAN-CVE-2026-15308"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.2-6+deb12u9"
}
]
}
],
"package": {
"name": "python3.11",
"purl": "pkg:deb/debian/python3.11?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.11.2-6",
"3.11.2-6+deb12u1",
"3.11.2-6+deb12u2",
"3.11.2-6+deb12u3",
"3.11.2-6+deb12u4",
"3.11.2-6+deb12u5",
"3.11.2-6+deb12u6",
"3.11.2-6+deb12u7",
"3.11.2-6+deb12u8"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15308.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python3.13",
"purl": "pkg:deb/debian/python3.13?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.13.11-1",
"3.13.12-1",
"3.13.14-1",
"3.13.15-1",
"3.13.5-2",
"3.13.5-2+deb13u1",
"3.13.5-2+deb13u2",
"3.13.5-2+deb13u3",
"3.13.5-2+deb13u4",
"3.13.5-2+deb13u5",
"3.13.6-1",
"3.13.7-1",
"3.13.8-1",
"3.13.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15308.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.13.15-1"
}
]
}
],
"package": {
"name": "python3.13",
"purl": "pkg:deb/debian/python3.13?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.13.11-1",
"3.13.12-1",
"3.13.14-1",
"3.13.5-2",
"3.13.6-1",
"3.13.7-1",
"3.13.8-1",
"3.13.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15308.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.14.7-1"
}
]
}
],
"package": {
"name": "python3.14",
"purl": "pkg:deb/debian/python3.14?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.14.0-1",
"3.14.0-2",
"3.14.0-3",
"3.14.0-4",
"3.14.0-5",
"3.14.0~a7-1",
"3.14.0~b1-1",
"3.14.0~b2-1",
"3.14.0~b3-1",
"3.14.0~b4-1",
"3.14.0~rc1-1",
"3.14.0~rc2-1",
"3.14.0~rc3-1",
"3.14.2-1",
"3.14.3-1",
"3.14.3-2",
"3.14.3-3",
"3.14.3-4",
"3.14.3-5",
"3.14.4-1",
"3.14.4-2",
"3.14.5-1",
"3.14.5~rc1-1",
"3.14.6-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15308.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-08T09:00:08.002423168Z",
"provider": "osv",
"upstream": [
"CVE-2026-15308"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-15308"
]
},
"related_cves": [
{
"value": "CVE-2026-15308",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 98826,
"published_at": "2026-07-09T17:16:58.26+00:00"
}