UnratedFix available
python: Fix of CVE-2026-15308
Type: advisorySources: OSV
- CVE-2026-15308: fix quadratic-complexity CPU denial-of-service in the HTMLParser incremental parser - accumulate feed() data in a buffer and only join/rescan once enough has piled up, instead of re-concatenating and re-scanning the whole unparsed buffer on every feed() call. Backported from upstream CPython (gh-153030, GH-153031).
- Products
- python, python-debug, python-devel, python-libs, python-test, python-tools, tkinter
- Affected versions
- Not specified
- Fixed versions
- 2.7.5-94.0.1.el7_9.tuxcare.els12
- CVEs
- CVE-2026-15308
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:35 UTC · Revision 1
Source evidence
- CVE-2026-15308: fix quadratic-complexity CPU denial-of-service in the HTMLParser incremental parser - accumulate feed() data in a buffer and only join/rescan once enough has piled up, instead of re-concatenating and re-scanning the whole unparsed buffer on every feed() call. Backported from upstream CPython (gh-153030, GH-153031).
osv:CLSA-2026-1784218124
python
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els12
python-debug
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els12
python-devel
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els12
python-libs
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els12
python-test
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els12
python-tools
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els12
tkinter
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els12
Complete source record
{
"id": "29ab12bfb4e339b574a16b606c7890134ff53c7da4eef24249be3454232887e0",
"url": "https://osv.dev/vulnerability/CLSA-2026-1784218124",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "python: Fix of CVE-2026-15308",
"summary": "- CVE-2026-15308: fix quadratic-complexity CPU denial-of-service in the HTMLParser incremental parser - accumulate feed() data in a buffer and only join/rescan once enough has piled up, instead of re-concatenating and re-scanning the whole unparsed buffer on every feed() call. Backported from upstream CPython (gh-153030, GH-153031).",
"evidence": "osv:CLSA-2026-1784218124",
"products": [
{
"name": {
"value": "python",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els12",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-debug",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els12",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-devel",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els12",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-libs",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els12",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-test",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els12",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-tools",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els12",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tkinter",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els12",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1784218124",
"aliases": [
"CLSA-2026-1784218124"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els12"
}
]
}
],
"package": {
"name": "python",
"purl": "pkg:rpm/tuxcare/python?distro=rhel-7",
"ecosystem": "TuxCare:RHEL:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1784218124.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els12"
}
]
}
],
"package": {
"name": "python-debug",
"purl": "pkg:rpm/tuxcare/python-debug?distro=rhel-7",
"ecosystem": "TuxCare:RHEL:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1784218124.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "python-devel",
"purl": "pkg:rpm/tuxcare/python-devel?distro=rhel-7",
"ecosystem": "TuxCare:RHEL:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1784218124.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els12"
}
]
}
],
"package": {
"name": "python-libs",
"purl": "pkg:rpm/tuxcare/python-libs?distro=rhel-7",
"ecosystem": "TuxCare:RHEL:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1784218124.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els12"
}
]
}
],
"package": {
"name": "python-test",
"purl": "pkg:rpm/tuxcare/python-test?distro=rhel-7",
"ecosystem": "TuxCare:RHEL:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1784218124.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els12"
}
]
}
],
"package": {
"name": "python-tools",
"purl": "pkg:rpm/tuxcare/python-tools?distro=rhel-7",
"ecosystem": "TuxCare:RHEL:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1784218124.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els12"
}
]
}
],
"package": {
"name": "tkinter",
"purl": "pkg:rpm/tuxcare/tkinter?distro=rhel-7",
"ecosystem": "TuxCare:RHEL:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/rhel7els/CLSA-2026-1784218124.json"
}
}
],
"modified": "2026-10-26T09:31:58.279180863Z",
"provider": "osv",
"upstream": [
"CVE-2026-15308"
],
"references": [
"https://errata.tuxcare.com/els_os/rhel7els/CLSA-2026-1784218124.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": 449192,
"published_at": "2026-07-16T16:09:06+00:00"
}