UnratedFix available
python2: Fix of CVE-2026-19445
Type: advisorySources: OSV
- CVE-2026-19445: fix a use-after-free in the SNI servername callback by taking the SSLContext from the live socket, with a strong reference, instead of the borrowed pointer registered on the SSL_CTX, and by unregistering the callback in context_dealloc, so a context released after the callback has switched the connection to another context can no longer be reached through the connection's session_ctx
- Products
- python2, python2-debug, python2-devel, python2-libs, python2-test, python2-tkinter, python2-tools
- Affected versions
- Not specified
- Fixed versions
- 2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17
- CVEs
- CVE-2026-19445
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:58 UTC · Revision 1
Source evidence
- CVE-2026-19445: fix a use-after-free in the SNI servername callback by taking the SSLContext from the live socket, with a strong reference, instead of the borrowed pointer registered on the SSL_CTX, and by unregistering the callback in context_dealloc, so a context released after the callback has switched the connection to another context can no longer be reached through the connection's session_ctx
osv:CLSA-2026-1791967190
python2
Fixed versions: 2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17
python2-debug
Fixed versions: 2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17
python2-devel
Fixed versions: 2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17
python2-libs
Fixed versions: 2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17
python2-test
Fixed versions: 2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17
python2-tkinter
Fixed versions: 2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17
python2-tools
Fixed versions: 2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17
Complete source record
{
"id": "b97c2d08e8b8c01378abe42a9e079221aed85846bd481214f7de410c23f5f402",
"url": "https://osv.dev/vulnerability/CLSA-2026-1791967190",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "python2: Fix of CVE-2026-19445",
"summary": "- CVE-2026-19445: fix a use-after-free in the SNI servername callback by taking the SSLContext from the live socket, with a strong reference, instead of the borrowed pointer registered on the SSL_CTX, and by unregistering the callback in context_dealloc, so a context released after the callback has switched the connection to another context can no longer be reached through the connection's session_ctx",
"evidence": "osv:CLSA-2026-1791967190",
"products": [
{
"name": {
"value": "python2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python2-debug",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python2-libs",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17",
"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": {
"value": "python2-tkinter",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python2-tools",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1791967190",
"aliases": [
"CLSA-2026-1791967190"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.18-17.module_el8+2680+c9cbfe57.tuxcare.els17"
}
]
}
],
"package": {
"name": "python2",
"purl": "pkg:rpm/tuxcare/python2?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791967190.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
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},
{
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}
]
}
],
"package": {
"name": "python2-debug",
"purl": "pkg:rpm/tuxcare/python2-debug?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791967190.json"
}
},
{
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}
]
}
],
"package": {
"name": "python2-devel",
"purl": "pkg:rpm/tuxcare/python2-devel?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791967190.json"
}
},
{
"ranges": [
{
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{
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},
{
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}
]
}
],
"package": {
"name": "python2-libs",
"purl": "pkg:rpm/tuxcare/python2-libs?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791967190.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-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791967190.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
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},
{
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}
]
}
],
"package": {
"name": "python2-tkinter",
"purl": "pkg:rpm/tuxcare/python2-tkinter?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791967190.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "python2-tools",
"purl": "pkg:rpm/tuxcare/python2-tools?distro=centos-stream-8",
"ecosystem": "TuxCare:CentOS-Stream:8"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos-stream8els/CLSA-2026-1791967190.json"
}
}
],
"modified": "2026-10-26T09:31:38.601486135Z",
"provider": "osv",
"upstream": [
"CVE-2026-19445"
],
"references": [
"https://errata.tuxcare.com/els_os/centos-stream8els/CLSA-2026-1791967190.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-19445"
]
},
"related_cves": [
{
"value": "CVE-2026-19445",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 447962,
"published_at": "2026-10-14T10:05:51+00:00"
}