python3.11: Fix of 2 CVEs
- CVE-2026-19445: ssl: resolve the SSLContext for the SNI servername callback from the connection instead of the borrowed SSL_CTX argument, and unregister the callback in context_dealloc, so a context dropped after sni_callback switched the connection is no longer used after it is freed - CVE-2026-19553: ssl: validate SSLContext.wrap_bio() arguments in SSLObject._create the way wrap_socket() does - reject server_hostname and session in server mode, and emit a DeprecationWarning when check_hostname is enabled but no server_hostname is given, surfacing the misconfiguration that made certificate hostname verification be skipped silently
- Products
- python3.11, python3.11-debug, python3.11-devel, python3.11-idle, python3.11-libs, python3.11-test, python3.11-tkinter
- Affected versions
- Not specified
- Fixed versions
- 3.11.11-2.el9_6.2.tuxcare.els18
- CVEs
- CVE-2026-19445, CVE-2026-19553
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:53 UTC · Revision 1
Source evidence
- CVE-2026-19445: ssl: resolve the SSLContext for the SNI servername callback from the connection instead of the borrowed SSL_CTX argument, and unregister the callback in context_dealloc, so a context dropped after sni_callback switched the connection is no longer used after it is freed - CVE-2026-19553: ssl: validate SSLContext.wrap_bio() arguments in SSLObject._create the way wrap_socket() does - reject server_hostname and session in server mode, and emit a DeprecationWarning when check_hostname is enabled but no server_hostname is given, surfacing the misconfiguration that made certificate hostname verification be skipped silently
osv:CLSA-2026-1791530000
python3.11
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els18
python3.11-debug
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els18
python3.11-devel
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els18
python3.11-idle
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els18
python3.11-libs
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els18
python3.11-test
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els18
python3.11-tkinter
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els18
Complete source record
{
"id": "3ee3bd2cd21bdf7d2705a053c3ea38f9ee73eaf69fe7e30288743c50b9ce27af",
"url": "https://osv.dev/vulnerability/CLSA-2026-1791530000",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "python3.11: Fix of 2 CVEs",
"summary": "- CVE-2026-19445: ssl: resolve the SSLContext for the SNI servername callback from the connection instead of the borrowed SSL_CTX argument, and unregister the callback in context_dealloc, so a context dropped after sni_callback switched the connection is no longer used after it is freed - CVE-2026-19553: ssl: validate SSLContext.wrap_bio() arguments in SSLObject._create the way wrap_socket() does - reject server_hostname and session in server mode, and emit a DeprecationWarning when check_hostname is enabled but no server_hostname is given, surfacing the misconfiguration that made certificate hostname verification be skipped silently",
"evidence": "osv:CLSA-2026-1791530000",
"products": [
{
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"evidence": "/affected/0/package/name"
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"affected_versions": []
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],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1791530000",
"aliases": [
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"affected": [
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"package": {
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"purl": "pkg:rpm/tuxcare/python3.11?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
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{
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"package": {
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"package": {
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"purl": "pkg:rpm/tuxcare/python3.11-tkinter?distro=almalinux-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1791530000.json"
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}
],
"modified": "2026-10-26T09:31:27.555052245Z",
"provider": "osv",
"upstream": [
"CVE-2026-19445",
"CVE-2026-19553"
],
"references": [
"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1791530000.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": 447679,
"published_at": "2026-10-09T07:13:33+00:00"
}