Important: python3.12 security update
Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * python: python: Certificate verification bypass via missing server_hostname validation in SSLContext.wrap_bio() (CVE-2026-19553) * python: Use-after-free of a server-side SSLContext when sni_callback switches contexts (CVE-2026-19445) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
- Products
- python3.12, python3.12-debug, python3.12-devel, python3.12-idle, python3.12-libs, python3.12-test, python3.12-tkinter
- Affected versions
- Not specified
- Fixed versions
- 3.12.15-1.el9_8
- CVEs
- Not specified
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 12:33 UTC · Revision 1
Source evidence
Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * python: python: Certificate verification bypass via missing server_hostname validation in SSLContext.wrap_bio() (CVE-2026-19553) * python: Use-after-free of a server-side SSLContext when sni_callback switches contexts (CVE-2026-19445) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
osv:ALSA-2026:77017
python3.12
Fixed versions: 3.12.15-1.el9_8
python3.12-debug
Fixed versions: 3.12.15-1.el9_8
python3.12-devel
Fixed versions: 3.12.15-1.el9_8
python3.12-idle
Fixed versions: 3.12.15-1.el9_8
python3.12-libs
Fixed versions: 3.12.15-1.el9_8
python3.12-test
Fixed versions: 3.12.15-1.el9_8
python3.12-tkinter
Fixed versions: 3.12.15-1.el9_8
Complete source record
{
"id": "7fcf79ccf9b4233221eb00a69999336878fc9cdb2c666e4acb79d451d423d07e",
"url": "https://osv.dev/vulnerability/ALSA-2026%3A77017",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Important: python3.12 security update",
"summary": "Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * python: python: Certificate verification bypass via missing server_hostname validation in SSLContext.wrap_bio() (CVE-2026-19553) * python: Use-after-free of a server-side SSLContext when sni_callback switches contexts (CVE-2026-19445) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
"evidence": "osv:ALSA-2026:77017",
"products": [
{
"name": {
"value": "python3.12",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.12.15-1.el9_8",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.12-debug",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.12.15-1.el9_8",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.12-devel",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.12.15-1.el9_8",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.12-idle",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.12.15-1.el9_8",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.12-libs",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.12.15-1.el9_8",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.12-test",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.12.15-1.el9_8",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.12-tkinter",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.12.15-1.el9_8",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "ALSA-2026:77017",
"aliases": [
"ALSA-2026:77017"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.12.15-1.el9_8"
}
]
}
],
"package": {
"name": "python3.12",
"purl": "pkg:rpm/almalinux/python3.12",
"ecosystem": "AlmaLinux:9"
},
"database_specific": {
"source": "https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:77017.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "python3.12-debug",
"purl": "pkg:rpm/almalinux/python3.12-debug",
"ecosystem": "AlmaLinux:9"
},
"database_specific": {
"source": "https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:77017.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.12.15-1.el9_8"
}
]
}
],
"package": {
"name": "python3.12-devel",
"purl": "pkg:rpm/almalinux/python3.12-devel",
"ecosystem": "AlmaLinux:9"
},
"database_specific": {
"source": "https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:77017.json"
}
},
{
"ranges": [
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{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "python3.12-idle",
"purl": "pkg:rpm/almalinux/python3.12-idle",
"ecosystem": "AlmaLinux:9"
},
"database_specific": {
"source": "https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:77017.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
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{
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}
]
}
],
"package": {
"name": "python3.12-libs",
"purl": "pkg:rpm/almalinux/python3.12-libs",
"ecosystem": "AlmaLinux:9"
},
"database_specific": {
"source": "https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:77017.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.12.15-1.el9_8"
}
]
}
],
"package": {
"name": "python3.12-test",
"purl": "pkg:rpm/almalinux/python3.12-test",
"ecosystem": "AlmaLinux:9"
},
"database_specific": {
"source": "https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:77017.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.12.15-1.el9_8"
}
]
}
],
"package": {
"name": "python3.12-tkinter",
"purl": "pkg:rpm/almalinux/python3.12-tkinter",
"ecosystem": "AlmaLinux:9"
},
"database_specific": {
"source": "https://github.com/AlmaLinux/osv-database/blob/master/advisories/almalinux9/ALSA-2026:77017.json"
}
}
],
"modified": "2026-10-09T12:11:47.018677037Z",
"provider": "osv",
"references": [
"https://access.redhat.com/errata/RHSA-2026:77017",
"https://access.redhat.com/security/cve/CVE-2026-19445",
"https://access.redhat.com/security/cve/CVE-2026-19553",
"https://bugzilla.redhat.com/2544127",
"https://bugzilla.redhat.com/2544138",
"https://errata.almalinux.org/9/ALSA-2026-77017.html"
]
},
"related_cves": [],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 120764,
"published_at": "2026-10-06T00:00:00+00:00"
}