Low
qt6-base, qtbase-opensource-src — security advisory
Uncontrolled recursion in QXmlStreamReader::readElementText() in Qt Group Qt allows attackers to cause a denial of service (application crash via stack exhaustion) via a crafted XML document.
- Products
- qt6-base, qtbase-opensource-src
- Affected versions
- 5.12.4+dfsg-4ubuntu1, 5.12.5+dfsg-2, 5.12.5+dfsg-8, 5.12.5+dfsg-8build1, 5.12.5+dfsg-9build1, 5.12.8+dfsg-0ubuntu1, 5.12.8+dfsg-0ubuntu2.1, 5.12.8+dfsg-0ubuntu2.1+esm1, 5.12.8+dfsg-0ubuntu2.1+esm2, 5.12.8+dfsg-0ubuntu2.1+esm3, 5.12.8+dfsg-0ubuntu2.1+esm4, 5.15.10+dfsg-3, 5.15.10+dfsg-5, 5.15.10+dfsg-5ubuntu1, 5.15.12+dfsg-1ubuntu1, 5.15.12+dfsg-3ubuntu1, 5.15.12+dfsg-3ubuntu6, 5.15.12+dfsg-3ubuntu7, 5.15.13+dfsg-1ubuntu1, 5.15.13+dfsg-1ubuntu1+esm1, 5.15.17+dfsg-1ubuntu1, 5.15.17+dfsg-1ubuntu2, 5.15.18+dfsg-1ubuntu1, 5.15.19+dfsg-2ubuntu1, 5.15.19+dfsg-2ubuntu2, 5.15.2+dfsg-12, 5.15.2+dfsg-13, 5.15.2+dfsg-14, 5.15.2+dfsg-14ubuntu1, 5.15.2+dfsg-14ubuntu3, 5.15.2+dfsg-15, 5.15.3+dfsg-1, 5.15.3+dfsg-2, 5.15.3+dfsg-2ubuntu0.1, 5.15.3+dfsg-2ubuntu0.2, 5.15.3+dfsg-2ubuntu0.2+esm1, 5.15.3+dfsg-2ubuntu0.2+esm2, 5.15.3+dfsg-2ubuntu0.2+esm3, 5.4.2+dfsg-2ubuntu9, 5.5.1+dfsg-10ubuntu2, 5.5.1+dfsg-13ubuntu1, 5.5.1+dfsg-13ubuntu2, 5.5.1+dfsg-13ubuntu3, 5.5.1+dfsg-14ubuntu1, 5.5.1+dfsg-14ubuntu2, 5.5.1+dfsg-14ubuntu3, 5.5.1+dfsg-15ubuntu1, 5.5.1+dfsg-16ubuntu1, 5.5.1+dfsg-16ubuntu6, 5.5.1+dfsg-16ubuntu7, 5.5.1+dfsg-16ubuntu7.1, 5.5.1+dfsg-16ubuntu7.2, 5.5.1+dfsg-16ubuntu7.5, 5.5.1+dfsg-16ubuntu7.6, 5.5.1+dfsg-16ubuntu7.7, 5.5.1+dfsg-16ubuntu7.7+esm1, 5.5.1+dfsg-16ubuntu7.7+esm2, 5.5.1+dfsg-6ubuntu4, 5.9.1+dfsg-10ubuntu1, 5.9.1+dfsg-10ubuntu2, 5.9.2+dfsg-4ubuntu6, 5.9.3+dfsg-0ubuntu1, 5.9.3+dfsg-0ubuntu3, 5.9.3+dfsg-0ubuntu4, 5.9.4+dfsg-0ubuntu3, 5.9.4+dfsg-0ubuntu4, 5.9.5+dfsg-0ubuntu1, 5.9.5+dfsg-0ubuntu2, 5.9.5+dfsg-0ubuntu2.1, 5.9.5+dfsg-0ubuntu2.3, 5.9.5+dfsg-0ubuntu2.4, 5.9.5+dfsg-0ubuntu2.5, 5.9.5+dfsg-0ubuntu2.6, 5.9.5+dfsg-0ubuntu2.6+esm1, 5.9.5+dfsg-0ubuntu2.6+esm2, 6.10.2+dfsg-14ubuntu2, 6.10.2+dfsg-15, 6.10.2+dfsg-16, 6.10.2+dfsg-3, 6.10.2+dfsg-6, 6.10.2+dfsg-7, 6.11.2+dfsg-4ubuntu2, 6.2.2+dfsg-5ubuntu1, 6.2.2+dfsg-6ubuntu1, 6.2.2+dfsg-6ubuntu2, 6.2.4+dfsg-1ubuntu1, 6.2.4+dfsg-2ubuntu1, 6.2.4+dfsg-2ubuntu1.1, 6.4.2+dfsg-18, 6.4.2+dfsg-19, 6.4.2+dfsg-19build1, 6.4.2+dfsg-20, 6.4.2+dfsg-21, 6.4.2+dfsg-21.1build4, 6.4.2+dfsg-21.1build5, 6.9.2+dfsg-1ubuntu1, 6.9.2+dfsg-2, 6.9.2+dfsg-3ubuntu1, 6.9.2+dfsg-3ubuntu2, 6.9.2+dfsg-4
- Fixed versions
- Not specified
- CVEs
- CVE-2026-78253
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:19 UTC · Revision 1
Source evidence
Uncontrolled recursion in QXmlStreamReader::readElementText() in Qt Group Qt allows attackers to cause a denial of service (application crash via stack exhaustion) via a crafted XML document.
osv:UBUNTU-CVE-2026-78253
qtbase-opensource-src
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
qt6-base
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
qt6-base
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
qt6-base
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
qt6-base
Fixed versions: Not specified
qtbase-opensource-src
Fixed versions: Not specified
Complete source record
{
"id": "76047ba557bd03f35b7c6416f868f8db4316d0e96231038f3c8df5f673be8d34",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-78253",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-78253",
"summary": "Uncontrolled recursion in QXmlStreamReader::readElementText() in Qt Group Qt allows attackers to cause a denial of service (application crash via stack exhaustion) via a crafted XML document.",
"evidence": "osv:UBUNTU-CVE-2026-78253",
"products": [
{
"name": {
"value": "qtbase-opensource-src",
"evidence": "/affected/0/package/name"
},
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-10ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-13ubuntu1",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-13ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-13ubuntu3",
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},
{
"value": "5.5.1+dfsg-14ubuntu1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-14ubuntu3",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-16ubuntu6",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-16ubuntu7",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-16ubuntu7.1",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-16ubuntu7.2",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-16ubuntu7.7",
"evidence": "/affected/0/versions"
},
{
"value": "5.5.1+dfsg-16ubuntu7.7+esm1",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
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{
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},
{
"value": "5.9.1+dfsg-10ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.2+dfsg-4ubuntu6",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.3+dfsg-0ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.3+dfsg-0ubuntu3",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.3+dfsg-0ubuntu4",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.4+dfsg-0ubuntu3",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.4+dfsg-0ubuntu4",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.5+dfsg-0ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.5+dfsg-0ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.5+dfsg-0ubuntu2.1",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.5+dfsg-0ubuntu2.3",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.5+dfsg-0ubuntu2.4",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.5+dfsg-0ubuntu2.5",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.5+dfsg-0ubuntu2.6",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.5+dfsg-0ubuntu2.6+esm1",
"evidence": "/affected/1/versions"
},
{
"value": "5.9.5+dfsg-0ubuntu2.6+esm2",
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}
]
},
{
"name": {
"value": "qtbase-opensource-src",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.12.4+dfsg-4ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "5.12.5+dfsg-2",
"evidence": "/affected/2/versions"
},
{
"value": "5.12.5+dfsg-8",
"evidence": "/affected/2/versions"
},
{
"value": "5.12.5+dfsg-8build1",
"evidence": "/affected/2/versions"
},
{
"value": "5.12.5+dfsg-9build1",
"evidence": "/affected/2/versions"
},
{
"value": "5.12.8+dfsg-0ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "5.12.8+dfsg-0ubuntu2.1",
"evidence": "/affected/2/versions"
},
{
"value": "5.12.8+dfsg-0ubuntu2.1+esm1",
"evidence": "/affected/2/versions"
},
{
"value": "5.12.8+dfsg-0ubuntu2.1+esm2",
"evidence": "/affected/2/versions"
},
{
"value": "5.12.8+dfsg-0ubuntu2.1+esm3",
"evidence": "/affected/2/versions"
},
{
"value": "5.12.8+dfsg-0ubuntu2.1+esm4",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "qt6-base",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.2.2+dfsg-5ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "6.2.2+dfsg-6ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "6.2.2+dfsg-6ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "6.2.4+dfsg-1ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "6.2.4+dfsg-2ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "6.2.4+dfsg-2ubuntu1.1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "qtbase-opensource-src",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "5.15.2+dfsg-12",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.2+dfsg-13",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.2+dfsg-14",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.2+dfsg-14ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.2+dfsg-14ubuntu3",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.2+dfsg-15",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.3+dfsg-1",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.3+dfsg-2",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.3+dfsg-2ubuntu0.1",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.3+dfsg-2ubuntu0.2",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.3+dfsg-2ubuntu0.2+esm1",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.3+dfsg-2ubuntu0.2+esm2",
"evidence": "/affected/4/versions"
},
{
"value": "5.15.3+dfsg-2ubuntu0.2+esm3",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "qt6-base",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.4.2+dfsg-18",
"evidence": "/affected/5/versions"
},
{
"value": "6.4.2+dfsg-19",
"evidence": "/affected/5/versions"
},
{
"value": "6.4.2+dfsg-19build1",
"evidence": "/affected/5/versions"
},
{
"value": "6.4.2+dfsg-20",
"evidence": "/affected/5/versions"
},
{
"value": "6.4.2+dfsg-21",
"evidence": "/affected/5/versions"
},
{
"value": "6.4.2+dfsg-21.1build4",
"evidence": "/affected/5/versions"
},
{
"value": "6.4.2+dfsg-21.1build5",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
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"evidence": "/affected/6/package/name"
},
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"fixed_versions": [],
"affected_versions": [
{
"value": "5.15.10+dfsg-3",
"evidence": "/affected/6/versions"
},
{
"value": "5.15.10+dfsg-5",
"evidence": "/affected/6/versions"
},
{
"value": "5.15.10+dfsg-5ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "5.15.12+dfsg-1ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "5.15.12+dfsg-3ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "5.15.12+dfsg-3ubuntu6",
"evidence": "/affected/6/versions"
},
{
"value": "5.15.12+dfsg-3ubuntu7",
"evidence": "/affected/6/versions"
},
{
"value": "5.15.13+dfsg-1ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "5.15.13+dfsg-1ubuntu1+esm1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "qt6-base",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.10.2+dfsg-7",
"evidence": "/affected/7/versions"
},
{
"value": "6.10.2+dfsg-14ubuntu2",
"evidence": "/affected/7/versions"
},
{
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"evidence": "/affected/7/versions"
},
{
"value": "6.10.2+dfsg-16",
"evidence": "/affected/7/versions"
},
{
"value": "6.11.2+dfsg-4ubuntu2",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "qtbase-opensource-src",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.15.18+dfsg-1ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "5.15.19+dfsg-2ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "5.15.19+dfsg-2ubuntu2",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "qt6-base",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.9.2+dfsg-1ubuntu1",
"evidence": "/affected/9/versions"
},
{
"value": "6.9.2+dfsg-2",
"evidence": "/affected/9/versions"
},
{
"value": "6.9.2+dfsg-3ubuntu1",
"evidence": "/affected/9/versions"
},
{
"value": "6.9.2+dfsg-3ubuntu2",
"evidence": "/affected/9/versions"
},
{
"value": "6.9.2+dfsg-4",
"evidence": "/affected/9/versions"
},
{
"value": "6.10.2+dfsg-3",
"evidence": "/affected/9/versions"
},
{
"value": "6.10.2+dfsg-6",
"evidence": "/affected/9/versions"
},
{
"value": "6.10.2+dfsg-7",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "qtbase-opensource-src",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "5.15.17+dfsg-1ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "5.15.17+dfsg-1ubuntu2",
"evidence": "/affected/10/versions"
},
{
"value": "5.15.18+dfsg-1ubuntu1",
"evidence": "/affected/10/versions"
}
]
}
],
"severity": "low",
"structured": {
"id": "UBUNTU-CVE-2026-78253",
"aliases": [
"UBUNTU-CVE-2026-78253"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/S:N/AU:N/R:U/RE:L/U:Green"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "qtbase-opensource-src",
"purl": "pkg:deb/ubuntu/qtbase-opensource-src?arch=source&distro=esm-infra%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"5.4.2+dfsg-2ubuntu9",
"5.5.1+dfsg-6ubuntu4",
"5.5.1+dfsg-10ubuntu2",
"5.5.1+dfsg-13ubuntu1",
"5.5.1+dfsg-13ubuntu2",
"5.5.1+dfsg-13ubuntu3",
"5.5.1+dfsg-14ubuntu1",
"5.5.1+dfsg-14ubuntu2",
"5.5.1+dfsg-14ubuntu3",
"5.5.1+dfsg-15ubuntu1",
"5.5.1+dfsg-16ubuntu1",
"5.5.1+dfsg-16ubuntu6",
"5.5.1+dfsg-16ubuntu7",
"5.5.1+dfsg-16ubuntu7.1",
"5.5.1+dfsg-16ubuntu7.2",
"5.5.1+dfsg-16ubuntu7.5",
"5.5.1+dfsg-16ubuntu7.6",
"5.5.1+dfsg-16ubuntu7.7",
"5.5.1+dfsg-16ubuntu7.7+esm1",
"5.5.1+dfsg-16ubuntu7.7+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78253.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libqt5concurrent5",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5core5a",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5dbus5",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5gui5",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5libqgtk2",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5network5",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5opengl5",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5printsupport5",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5sql5",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5sql5-mysql",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5sql5-odbc",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5sql5-psql",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
{
"binary_name": "libqt5sql5-sqlite",
"binary_version": "5.5.1+dfsg-16ubuntu7.7+esm2"
},
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],
"modified": "2026-10-17T13:01:09.366462374Z",
"provider": "osv",
"upstream": [
"CVE-2026-78253"
],
"references": [
"https://ubuntu.com/security/CVE-2026-78253",
"https://www.cve.org/CVERecord?id=CVE-2026-78253",
"https://codereview.qt-project.org/c/qt/qtbase/+/754345"
]
},
"related_cves": [
{
"value": "CVE-2026-78253",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361083,
"published_at": "2026-09-23T12:17:00+00:00"
}