python: Fix of 5 CVEs
- CVE-2026-7210: seed Expat's hash-flooding protection with a full 16 bytes (128 bits) of entropy via XML_SetHashSalt16Bytes() when the loaded libexpat provides it (detected via a weak symbol), instead of the brute-forceable 8-byte XML_SetHashSalt(); the pyexpat CAPI gains a SetHashSalt16Bytes pointer appended at the end of the struct (capsule magic unchanged) and _Py_HashSecret_t gains a 16-byte hashsalt16 field. Both call sites fall back to the legacy 8-byte API when the salt is all zeros (hash randomization off, the default) so Expat keeps self-seeding. Paired with the libexpat CVE-2026-41080 backport that exports the symbol; requires expat >= 2.1.0-15.0.7.el7_9.tuxcare.els3, the release shipping it
- Products
- python, python-debug, python-devel, python-libs, python-test, python-tools, tkinter
- Affected versions
- Not specified
- Fixed versions
- 2.7.5-94.0.1.el7_9.tuxcare.els9
- CVEs
- CVE-2026-41080, CVE-2026-7210
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:51 UTC · Revision 1
Source evidence
- CVE-2026-7210: seed Expat's hash-flooding protection with a full 16 bytes (128 bits) of entropy via XML_SetHashSalt16Bytes() when the loaded libexpat provides it (detected via a weak symbol), instead of the brute-forceable 8-byte XML_SetHashSalt(); the pyexpat CAPI gains a SetHashSalt16Bytes pointer appended at the end of the struct (capsule magic unchanged) and _Py_HashSecret_t gains a 16-byte hashsalt16 field. Both call sites fall back to the legacy 8-byte API when the salt is all zeros (hash randomization off, the default) so Expat keeps self-seeding. Paired with the libexpat CVE-2026-41080 backport that exports the symbol; requires expat >= 2.1.0-15.0.7.el7_9.tuxcare.els3, the release shipping it
osv:CLSA-2026-1781252889
python
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els9
python-debug
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els9
python-devel
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els9
python-libs
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els9
python-test
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els9
python-tools
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els9
tkinter
Fixed versions: 2.7.5-94.0.1.el7_9.tuxcare.els9
Complete source record
{
"id": "e5ba1b7d9aa4409888435005045cc6b6358c852ce21070c72958808c909b4a0c",
"url": "https://osv.dev/vulnerability/CLSA-2026-1781252889",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "python: Fix of 5 CVEs",
"summary": "- CVE-2026-7210: seed Expat's hash-flooding protection with a full 16 bytes (128 bits) of entropy via XML_SetHashSalt16Bytes() when the loaded libexpat provides it (detected via a weak symbol), instead of the brute-forceable 8-byte XML_SetHashSalt(); the pyexpat CAPI gains a SetHashSalt16Bytes pointer appended at the end of the struct (capsule magic unchanged) and _Py_HashSecret_t gains a 16-byte hashsalt16 field. Both call sites fall back to the legacy 8-byte API when the salt is all zeros (hash randomization off, the default) so Expat keeps self-seeding. Paired with the libexpat CVE-2026-41080 backport that exports the symbol; requires expat >= 2.1.0-15.0.7.el7_9.tuxcare.els3, the release shipping it",
"evidence": "osv:CLSA-2026-1781252889",
"products": [
{
"name": {
"value": "python",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els9",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-debug",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els9",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-devel",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els9",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-libs",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els9",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-test",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els9",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-tools",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els9",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "tkinter",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.7.5-94.0.1.el7_9.tuxcare.els9",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1781252889",
"aliases": [
"CLSA-2026-1781252889"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els9"
}
]
}
],
"package": {
"name": "python",
"purl": "pkg:rpm/tuxcare/python?distro=oraclelinux-7",
"ecosystem": "TuxCare:OracleLinux:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1781252889.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els9"
}
]
}
],
"package": {
"name": "python-debug",
"purl": "pkg:rpm/tuxcare/python-debug?distro=oraclelinux-7",
"ecosystem": "TuxCare:OracleLinux:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1781252889.json"
}
},
{
"ranges": [
{
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{
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{
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}
]
}
],
"package": {
"name": "python-devel",
"purl": "pkg:rpm/tuxcare/python-devel?distro=oraclelinux-7",
"ecosystem": "TuxCare:OracleLinux:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1781252889.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "python-libs",
"purl": "pkg:rpm/tuxcare/python-libs?distro=oraclelinux-7",
"ecosystem": "TuxCare:OracleLinux:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1781252889.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els9"
}
]
}
],
"package": {
"name": "python-test",
"purl": "pkg:rpm/tuxcare/python-test?distro=oraclelinux-7",
"ecosystem": "TuxCare:OracleLinux:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1781252889.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els9"
}
]
}
],
"package": {
"name": "python-tools",
"purl": "pkg:rpm/tuxcare/python-tools?distro=oraclelinux-7",
"ecosystem": "TuxCare:OracleLinux:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1781252889.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.7.5-94.0.1.el7_9.tuxcare.els9"
}
]
}
],
"package": {
"name": "tkinter",
"purl": "pkg:rpm/tuxcare/tkinter?distro=oraclelinux-7",
"ecosystem": "TuxCare:OracleLinux:7"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1781252889.json"
}
}
],
"modified": "2026-10-26T09:43:35.130957156Z",
"provider": "osv",
"upstream": [
"CVE-2026-41080",
"CVE-2026-7210"
],
"references": [
"https://errata.tuxcare.com/els_os/oraclelinux7els/CLSA-2026-1781252889.html",
"https://nvd.nist.gov/vuln/detail/CVE-2021-3737",
"https://nvd.nist.gov/vuln/detail/CVE-2022-45061",
"https://nvd.nist.gov/vuln/detail/CVE-2022-48560",
"https://nvd.nist.gov/vuln/detail/CVE-2022-48565",
"https://nvd.nist.gov/vuln/detail/CVE-2026-7210"
]
},
"related_cves": [
{
"value": "CVE-2026-41080",
"evidence": "/upstream"
},
{
"value": "CVE-2026-7210",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 450004,
"published_at": "2026-06-25T08:32:14+00:00"
}