UnratedFix available
python3: Fix of 3 CVEs
Type: advisorySources: OSV
- CVE-2026-6100: clear dangling next_in pointer on MemoryError in bz2/lzma decompressors to avoid use-after-free on instance reuse - CVE-2026-4786: validate the post-substitution URL in webbrowser UnixBrowser.open so that "%action" cannot smuggle a dash-prefixed flag past the CVE-2026-4519 dash-prefix check
- Products
- platform-python, platform-python-debug, platform-python-devel, python3-devel, python3-idle, python3-libs, python3-test, python3-tkinter
- Affected versions
- Not specified
- Fixed versions
- 3.6.8-40.el8_4.tuxcare.els19
- CVEs
- CVE-2026-4519, CVE-2026-4786, CVE-2026-6100
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 13:55 UTC · Revision 1
Source evidence
- CVE-2026-6100: clear dangling next_in pointer on MemoryError in bz2/lzma decompressors to avoid use-after-free on instance reuse - CVE-2026-4786: validate the post-substitution URL in webbrowser UnixBrowser.open so that "%action" cannot smuggle a dash-prefixed flag past the CVE-2026-4519 dash-prefix check
osv:CLSA-2026-1777626401
platform-python
Fixed versions: 3.6.8-40.el8_4.tuxcare.els19
platform-python-debug
Fixed versions: 3.6.8-40.el8_4.tuxcare.els19
platform-python-devel
Fixed versions: 3.6.8-40.el8_4.tuxcare.els19
python3-devel
Fixed versions: 3.6.8-40.el8_4.tuxcare.els19
python3-idle
Fixed versions: 3.6.8-40.el8_4.tuxcare.els19
python3-libs
Fixed versions: 3.6.8-40.el8_4.tuxcare.els19
python3-test
Fixed versions: 3.6.8-40.el8_4.tuxcare.els19
python3-tkinter
Fixed versions: 3.6.8-40.el8_4.tuxcare.els19
Complete source record
{
"id": "a5264eaffa133dfca8aef5cf6d45409459b99f4fffc399ca5c2778c51abbc2fc",
"url": "https://osv.dev/vulnerability/CLSA-2026-1777626401",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "python3: Fix of 3 CVEs",
"summary": "- CVE-2026-6100: clear dangling next_in pointer on MemoryError in bz2/lzma decompressors to avoid use-after-free on instance reuse - CVE-2026-4786: validate the post-substitution URL in webbrowser UnixBrowser.open so that \"%action\" cannot smuggle a dash-prefixed flag past the CVE-2026-4519 dash-prefix check",
"evidence": "osv:CLSA-2026-1777626401",
"products": [
{
"name": {
"value": "platform-python",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.8-40.el8_4.tuxcare.els19",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/1/ranges"
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{
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{
"name": {
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"evidence": "/affected/3/ranges"
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"affected_versions": []
},
{
"name": {
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"evidence": "/affected/4/package/name"
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"affected_versions": []
},
{
"name": {
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{
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"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3-test",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
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{
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"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3-tkinter",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.8-40.el8_4.tuxcare.els19",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1777626401",
"aliases": [
"CLSA-2026-1777626401"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "platform-python",
"purl": "pkg:rpm/tuxcare/platform-python?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1777626401.json"
}
},
{
"ranges": [
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],
"package": {
"name": "platform-python-debug",
"purl": "pkg:rpm/tuxcare/platform-python-debug?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
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"package": {
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"purl": "pkg:rpm/tuxcare/platform-python-devel?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
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"database_specific": {
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"package": {
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"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
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},
{
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],
"package": {
"name": "python3-idle",
"purl": "pkg:rpm/tuxcare/python3-idle?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
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{
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],
"package": {
"name": "python3-libs",
"purl": "pkg:rpm/tuxcare/python3-libs?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
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},
{
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],
"package": {
"name": "python3-test",
"purl": "pkg:rpm/tuxcare/python3-test?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
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}
},
{
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],
"package": {
"name": "python3-tkinter",
"purl": "pkg:rpm/tuxcare/python3-tkinter?distro=centos-8.4",
"ecosystem": "TuxCare:CentOS:8.4"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/centos8.4els/CLSA-2026-1777626401.json"
}
}
],
"modified": "2026-10-21T10:47:58.988972804Z",
"provider": "osv",
"upstream": [
"CVE-2026-4519",
"CVE-2026-4786",
"CVE-2026-6100"
],
"references": [
"https://errata.tuxcare.com/els_os/centos8.4els/CLSA-2026-1777626401.html"
]
},
"related_cves": [
{
"value": "CVE-2026-4519",
"evidence": "/upstream"
},
{
"value": "CVE-2026-4786",
"evidence": "/upstream"
},
{
"value": "CVE-2026-6100",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 392479,
"published_at": "2026-05-01T09:06:46+00:00"
}