UnratedFix available
python3.11: Fix of 4 CVEs
Type: advisorySources: OSV
- CVE-2026-0865: reject control characters in wsgiref.headers.Headers - CVE-2025-15366: reject control characters in IMAP commands - CVE-2025-15367: reject control characters in POP3 commands - CVE-2026-1299: verify headers are sound in email BytesGenerator
- 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.els4
- CVEs
- CVE-2025-15366, CVE-2025-15367, CVE-2026-0865, CVE-2026-1299
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 13:53 UTC · Revision 1
Source evidence
- CVE-2026-0865: reject control characters in wsgiref.headers.Headers - CVE-2025-15366: reject control characters in IMAP commands - CVE-2025-15367: reject control characters in POP3 commands - CVE-2026-1299: verify headers are sound in email BytesGenerator
osv:CLSA-2026-1774525255
python3.11
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els4
python3.11-debug
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els4
python3.11-devel
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els4
python3.11-idle
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els4
python3.11-libs
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els4
python3.11-test
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els4
python3.11-tkinter
Fixed versions: 3.11.11-2.el9_6.2.tuxcare.els4
Complete source record
{
"id": "5f1c9fda05f38c1f6b006f31f04f24a9ddd106b411fea5e8249db467de9695db",
"url": "https://osv.dev/vulnerability/CLSA-2026-1774525255",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "python3.11: Fix of 4 CVEs",
"summary": "- CVE-2026-0865: reject control characters in wsgiref.headers.Headers - CVE-2025-15366: reject control characters in IMAP commands - CVE-2025-15367: reject control characters in POP3 commands - CVE-2026-1299: verify headers are sound in email BytesGenerator",
"evidence": "osv:CLSA-2026-1774525255",
"products": [
{
"name": {
"value": "python3.11",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.11-2.el9_6.2.tuxcare.els4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-debug",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.11-2.el9_6.2.tuxcare.els4",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-devel",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.11-2.el9_6.2.tuxcare.els4",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-idle",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.11-2.el9_6.2.tuxcare.els4",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-libs",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.11-2.el9_6.2.tuxcare.els4",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-test",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.11-2.el9_6.2.tuxcare.els4",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11-tkinter",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.11-2.el9_6.2.tuxcare.els4",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1774525255",
"aliases": [
"CLSA-2026-1774525255"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.11-2.el9_6.2.tuxcare.els4"
}
]
}
],
"package": {
"name": "python3.11",
"purl": "pkg:rpm/tuxcare/python3.11?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-2026-1774525255.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.11-2.el9_6.2.tuxcare.els4"
}
]
}
],
"package": {
"name": "python3.11-debug",
"purl": "pkg:rpm/tuxcare/python3.11-debug?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-2026-1774525255.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
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}
]
}
],
"package": {
"name": "python3.11-devel",
"purl": "pkg:rpm/tuxcare/python3.11-devel?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-2026-1774525255.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-9.6",
"ecosystem": "TuxCare:AlmaLinux:9.6"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/almalinux9.6esu/CLSA-2026-1774525255.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.11-2.el9_6.2.tuxcare.els4"
}
]
}
],
"package": {
"name": "python3.11-libs",
"purl": "pkg:rpm/tuxcare/python3.11-libs?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-2026-1774525255.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.11-2.el9_6.2.tuxcare.els4"
}
]
}
],
"package": {
"name": "python3.11-test",
"purl": "pkg:rpm/tuxcare/python3.11-test?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-2026-1774525255.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.11-2.el9_6.2.tuxcare.els4"
}
]
}
],
"package": {
"name": "python3.11-tkinter",
"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-2026-1774525255.json"
}
}
],
"modified": "2026-10-21T10:47:24.907493771Z",
"provider": "osv",
"upstream": [
"CVE-2025-15366",
"CVE-2025-15367",
"CVE-2026-0865",
"CVE-2026-1299"
],
"references": [
"https://errata.tuxcare.com/els_os/tuxcare9.6esu/CLSA-2026-1774525255.html"
]
},
"related_cves": [
{
"value": "CVE-2025-15366",
"evidence": "/upstream"
},
{
"value": "CVE-2025-15367",
"evidence": "/upstream"
},
{
"value": "CVE-2026-0865",
"evidence": "/upstream"
},
{
"value": "CVE-2026-1299",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 392344,
"published_at": "2026-03-26T11:40:59+00:00"
}