UnratedFix available
python3.9: Fix of 2 CVEs
Type: advisorySources: OSV
- CVE-2026-19445: prevent use-after-free in the TLS server name callback when switching SSL contexts - CVE-2026-19553: validate SSLObject server hostname and session parameters before wrapping memory BIOs
- Products
- python-unversioned-command, python3, python3-debug, python3-devel, python3-idle, python3-libs, python3-test, python3-tkinter
- Affected versions
- Not specified
- Fixed versions
- 3.9.16-1.el9_2.2.tuxcare.els38
- CVEs
- CVE-2026-19445, CVE-2026-19553
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:44 UTC · Revision 1
Source evidence
- CVE-2026-19445: prevent use-after-free in the TLS server name callback when switching SSL contexts - CVE-2026-19553: validate SSLObject server hostname and session parameters before wrapping memory BIOs
osv:CLSA-2026-1791820273
python-unversioned-command
Fixed versions: 3.9.16-1.el9_2.2.tuxcare.els38
python3
Fixed versions: 3.9.16-1.el9_2.2.tuxcare.els38
python3-debug
Fixed versions: 3.9.16-1.el9_2.2.tuxcare.els38
python3-devel
Fixed versions: 3.9.16-1.el9_2.2.tuxcare.els38
python3-idle
Fixed versions: 3.9.16-1.el9_2.2.tuxcare.els38
python3-libs
Fixed versions: 3.9.16-1.el9_2.2.tuxcare.els38
python3-test
Fixed versions: 3.9.16-1.el9_2.2.tuxcare.els38
python3-tkinter
Fixed versions: 3.9.16-1.el9_2.2.tuxcare.els38
Complete source record
{
"id": "4d2369b9e087c7af22343214bb09259b3409b917e13506c206a9688fc9fdb62b",
"url": "https://osv.dev/vulnerability/CLSA-2026-1791820273",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "python3.9: Fix of 2 CVEs",
"summary": "- CVE-2026-19445: prevent use-after-free in the TLS server name callback when switching SSL contexts - CVE-2026-19553: validate SSLObject server hostname and session parameters before wrapping memory BIOs",
"evidence": "osv:CLSA-2026-1791820273",
"products": [
{
"name": {
"value": "python-unversioned-command",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.9.16-1.el9_2.2.tuxcare.els38",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
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{
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"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/2/ranges"
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],
"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": {
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"evidence": "/affected/4/package/name"
},
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"fixed_versions": [
{
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"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
"prerequisites": [],
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{
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"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3-test",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.9.16-1.el9_2.2.tuxcare.els38",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3-tkinter",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.9.16-1.el9_2.2.tuxcare.els38",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1791820273",
"aliases": [
"CLSA-2026-1791820273"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.9.16-1.el9_2.2.tuxcare.els38"
}
]
}
],
"package": {
"name": "python-unversioned-command",
"purl": "pkg:rpm/tuxcare/python-unversioned-command?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1791820273.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "python3",
"purl": "pkg:rpm/tuxcare/python3?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1791820273.json"
}
},
{
"ranges": [
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],
"package": {
"name": "python3-debug",
"purl": "pkg:rpm/tuxcare/python3-debug?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1791820273.json"
}
},
{
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}
]
}
],
"package": {
"name": "python3-devel",
"purl": "pkg:rpm/tuxcare/python3-devel?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1791820273.json"
}
},
{
"ranges": [
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}
]
}
],
"package": {
"name": "python3-idle",
"purl": "pkg:rpm/tuxcare/python3-idle?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1791820273.json"
}
},
{
"ranges": [
{
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]
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],
"package": {
"name": "python3-libs",
"purl": "pkg:rpm/tuxcare/python3-libs?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1791820273.json"
}
},
{
"ranges": [
{
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{
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},
{
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}
]
}
],
"package": {
"name": "python3-test",
"purl": "pkg:rpm/tuxcare/python3-test?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1791820273.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "python3-tkinter",
"purl": "pkg:rpm/tuxcare/python3-tkinter?distro=almalinux-9.2",
"ecosystem": "TuxCare:AlmaLinux:9.2"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.2esu/CLSA-2026-1791820273.json"
}
}
],
"modified": "2026-10-26T09:30:39.105478528Z",
"provider": "osv",
"upstream": [
"CVE-2026-19445",
"CVE-2026-19553"
],
"references": [
"https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1791820273.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-19445",
"https://nvd.nist.gov/vuln/detail/CVE-2026-19553"
]
},
"related_cves": [
{
"value": "CVE-2026-19445",
"evidence": "/upstream"
},
{
"value": "CVE-2026-19553",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 447184,
"published_at": "2026-10-12T15:51:25+00:00"
}