UnratedFix available
python3.11: Fix of 2 CVEs
Type: advisorySources: OSV
- CVE-2026-6879: xml.etree.ElementPath: avoid quadratic behaviour in XPath index predicates ([1], [last()], [last()-N]) - CVE-2026-18503: fix quadratic time in csv.Sniffer for quoted fields - Backport upstream 3.11 fixes the CVE-2026-18503 fix relies on or completes: correct matching of possessive quantifiers in the re engine (gh-106052, gh-100061) and super-linear doublequote detection in csv.Sniffer (gh-109638)
- 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
- 3.11.2-2.el9_2.2.tuxcare.els39
- CVEs
- CVE-2026-18503, CVE-2026-6879
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:45 UTC · Revision 1
Source evidence
- CVE-2026-6879: xml.etree.ElementPath: avoid quadratic behaviour in XPath index predicates ([1], [last()], [last()-N]) - CVE-2026-18503: fix quadratic time in csv.Sniffer for quoted fields - Backport upstream 3.11 fixes the CVE-2026-18503 fix relies on or completes: correct matching of possessive quantifiers in the re engine (gh-106052, gh-100061) and super-linear doublequote detection in csv.Sniffer (gh-109638)
osv:CLSA-2026-1791921187
python3.11
Fixed versions: 3.11.2-2.el9_2.2.tuxcare.els39
python3.11-debug
Fixed versions: 3.11.2-2.el9_2.2.tuxcare.els39
python3.11-devel
Fixed versions: 3.11.2-2.el9_2.2.tuxcare.els39
python3.11-idle
Fixed versions: 3.11.2-2.el9_2.2.tuxcare.els39
python3.11-libs
Fixed versions: 3.11.2-2.el9_2.2.tuxcare.els39
python3.11-test
Fixed versions: 3.11.2-2.el9_2.2.tuxcare.els39
python3.11-tkinter
Fixed versions: 3.11.2-2.el9_2.2.tuxcare.els39
Complete source record
{
"id": "c41134b3fc5a58ac5c1b7ded9fbddf3ba218ff1adb22d1156a4b8135a53f089e",
"url": "https://osv.dev/vulnerability/CLSA-2026-1791921187",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "python3.11: Fix of 2 CVEs",
"summary": "- CVE-2026-6879: xml.etree.ElementPath: avoid quadratic behaviour in XPath index predicates ([1], [last()], [last()-N]) - CVE-2026-18503: fix quadratic time in csv.Sniffer for quoted fields - Backport upstream 3.11 fixes the CVE-2026-18503 fix relies on or completes: correct matching of possessive quantifiers in the re engine (gh-106052, gh-100061) and super-linear doublequote detection in csv.Sniffer (gh-109638)",
"evidence": "osv:CLSA-2026-1791921187",
"products": [
{
"name": {
"value": "python3.11",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.2-2.el9_2.2.tuxcare.els39",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-debug",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-devel",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.2-2.el9_2.2.tuxcare.els39",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-idle",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.2-2.el9_2.2.tuxcare.els39",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-libs",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.2-2.el9_2.2.tuxcare.els39",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-test",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.2-2.el9_2.2.tuxcare.els39",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-tkinter",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.2-2.el9_2.2.tuxcare.els39",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1791921187",
"aliases": [
"CLSA-2026-1791921187"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.2-2.el9_2.2.tuxcare.els39"
}
]
}
],
"package": {
"name": "python3.11",
"purl": "pkg:rpm/tuxcare/python3.11?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-2026-1791921187.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "python3.11-debug",
"purl": "pkg:rpm/tuxcare/python3.11-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-2026-1791921187.json"
}
},
{
"ranges": [
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}
]
}
],
"package": {
"name": "python3.11-devel",
"purl": "pkg:rpm/tuxcare/python3.11-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-2026-1791921187.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "python3.11-idle",
"purl": "pkg:rpm/tuxcare/python3.11-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-2026-1791921187.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.2-2.el9_2.2.tuxcare.els39"
}
]
}
],
"package": {
"name": "python3.11-libs",
"purl": "pkg:rpm/tuxcare/python3.11-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-2026-1791921187.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.2-2.el9_2.2.tuxcare.els39"
}
]
}
],
"package": {
"name": "python3.11-test",
"purl": "pkg:rpm/tuxcare/python3.11-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-2026-1791921187.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.2-2.el9_2.2.tuxcare.els39"
}
]
}
],
"package": {
"name": "python3.11-tkinter",
"purl": "pkg:rpm/tuxcare/python3.11-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-2026-1791921187.json"
}
}
],
"modified": "2026-10-26T09:43:11.991865714Z",
"provider": "osv",
"upstream": [
"CVE-2026-18503",
"CVE-2026-6879"
],
"references": [
"https://errata.tuxcare.com/els_os/almalinux9.2esu/CLSA-2026-1791921187.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-18503",
"https://nvd.nist.gov/vuln/detail/CVE-2026-6879"
]
},
"related_cves": [
{
"value": "CVE-2026-18503",
"evidence": "/upstream"
},
{
"value": "CVE-2026-6879",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449746,
"published_at": "2026-10-13T19:53:19+00:00"
}