UnratedFix available
python2: Fix of CVE-2026-15308
Type: advisorySources: OSV
- CVE-2026-15308: fix quadratic complexity in HTMLParser incremental parsing; an unterminated markup construct fed across many feed() calls no longer causes the growing buffer to be rescanned and reconcatenated on every call (CPU denial of service). Adds a regression test.
- Products
- python2, python2-debug, python2-devel, python2-libs, python2-test, python2-tkinter, python2-tools
- Affected versions
- Not specified
- Fixed versions
- 2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26
- CVEs
- CVE-2026-15308
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:13 UTC · Revision 1
Source evidence
- CVE-2026-15308: fix quadratic complexity in HTMLParser incremental parsing; an unterminated markup construct fed across many feed() calls no longer causes the growing buffer to be rescanned and reconcatenated on every call (CPU denial of service). Adds a regression test.
osv:CLSA-2026-1784798087
python2
Fixed versions: 2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26
python2-debug
Fixed versions: 2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26
python2-devel
Fixed versions: 2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26
python2-libs
Fixed versions: 2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26
python2-test
Fixed versions: 2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26
python2-tkinter
Fixed versions: 2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26
python2-tools
Fixed versions: 2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26
Complete source record
{
"id": "c6d50931e9156e39f28df4d443523e389bb7f7d854e8f7ac6de5375c6c93cf5b",
"url": "https://osv.dev/vulnerability/CLSA-2026-1784798087",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "python2: Fix of CVE-2026-15308",
"summary": "- CVE-2026-15308: fix quadratic complexity in HTMLParser incremental parsing; an unterminated markup construct fed across many feed() calls no longer causes the growing buffer to be rescanned and reconcatenated on every call (CPU denial of service). Adds a regression test.",
"evidence": "osv:CLSA-2026-1784798087",
"products": [
{
"name": {
"value": "python2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python2-debug",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
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"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
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"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
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{
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"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python2-test",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
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{
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"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python2-tools",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1784798087",
"aliases": [
"CLSA-2026-1784798087"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26"
}
]
}
],
"package": {
"name": "python2",
"purl": "pkg:rpm/tuxcare/python2?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1784798087.json"
}
},
{
"ranges": [
{
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"events": [
{
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{
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}
]
}
],
"package": {
"name": "python2-debug",
"purl": "pkg:rpm/tuxcare/python2-debug?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1784798087.json"
}
},
{
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]
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],
"package": {
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"purl": "pkg:rpm/tuxcare/python2-devel?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1784798087.json"
}
},
{
"ranges": [
{
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{
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}
]
}
],
"package": {
"name": "python2-libs",
"purl": "pkg:rpm/tuxcare/python2-libs?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1784798087.json"
}
},
{
"ranges": [
{
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{
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},
{
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}
]
}
],
"package": {
"name": "python2-test",
"purl": "pkg:rpm/tuxcare/python2-test?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1784798087.json"
}
},
{
"ranges": [
{
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{
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},
{
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}
]
}
],
"package": {
"name": "python2-tkinter",
"purl": "pkg:rpm/tuxcare/python2-tkinter?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1784798087.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
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},
{
"fixed": "2.7.18-4.module_el8.4.0+2447+458ce58e.tuxcare.els26"
}
]
}
],
"package": {
"name": "python2-tools",
"purl": "pkg:rpm/tuxcare/python2-tools?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1784798087.json"
}
}
],
"modified": "2026-10-26T09:31:50.334273870Z",
"provider": "osv",
"upstream": [
"CVE-2026-15308"
],
"references": [
"https://errata.tuxcare.com/els_os/centos8.4els/CLSA-2026-1784798087.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-15308"
]
},
"related_cves": [
{
"value": "CVE-2026-15308",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448631,
"published_at": "2026-07-23T09:15:13+00:00"
}