MediumFix available
mariadb — security advisory
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
- Products
- mariadb
- Affected versions
- 1:10.11.11-0+deb12u1, 1:10.11.13-0+deb12u1, 1:10.11.14-0+deb12u1, 1:10.11.14-0+deb12u2, 1:10.11.3-1, 1:10.11.3-2~exp1, 1:10.11.4-1, 1:10.11.4-1~deb12u1, 1:10.11.5-1, 1:10.11.5-2, 1:10.11.5-3, 1:10.11.6-0+deb12u1, 1:10.11.6-1, 1:10.11.6-2, 1:10.11.6-2.1~exp1, 1:10.11.7-1, 1:10.11.7-2, 1:10.11.7-3, 1:10.11.7-4, 1:10.11.8-1, 1:10.11.9-0+deb12u1, 1:11.8.2-1, 1:11.8.3-0+deb13u1, 1:11.8.3-1, 1:11.8.5-1, 1:11.8.5-2, 1:11.8.5-3, 1:11.8.5-3~exp1, 1:11.8.5-3~exp2, 1:11.8.5-3~exp3, 1:11.8.5-4
- Fixed versions
- 1:10.11.18-0+deb12u1, 1:11.8.6-0+deb13u1, 1:11.8.6-1
- CVEs
- CVE-2026-34303
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:45 UTC · Revision 2
Source evidence
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
osv:DEBIAN-CVE-2026-34303
mariadb
Fixed versions: 1:10.11.18-0+deb12u1
mariadb
Fixed versions: 1:11.8.6-0+deb13u1
mariadb
Fixed versions: 1:11.8.6-1
Complete source record
{
"id": "b15d64b44c8e37161e834647260026279f9198eae133430f2576a97cfe5bb9e1",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-34303",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-34303",
"summary": "Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and 9.0.0-9.6.0. Easily exploitable vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).",
"evidence": "osv:DEBIAN-CVE-2026-34303",
"products": [
{
"name": {
"value": "mariadb",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:10.11.18-0+deb12u1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1:10.11.11-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.13-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.14-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.14-0+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.3-2~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.4-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.5-2",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.5-3",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.6-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.6-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.6-2",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.6-2.1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.7-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.7-2",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.7-3",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.7-4",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.8-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:10.11.9-0+deb12u1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "mariadb",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:11.8.6-0+deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1:11.8.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:11.8.3-0+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:11.8.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:11.8.5-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:11.8.5-2",
"evidence": "/affected/1/versions"
},
{
"value": "1:11.8.5-3",
"evidence": "/affected/1/versions"
},
{
"value": "1:11.8.5-3~exp1",
"evidence": "/affected/1/versions"
},
{
"value": "1:11.8.5-3~exp2",
"evidence": "/affected/1/versions"
},
{
"value": "1:11.8.5-3~exp3",
"evidence": "/affected/1/versions"
},
{
"value": "1:11.8.5-4",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "mariadb",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:11.8.6-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1:11.8.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:11.8.3-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:11.8.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:11.8.5-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:11.8.5-3",
"evidence": "/affected/2/versions"
},
{
"value": "1:11.8.5-3~exp1",
"evidence": "/affected/2/versions"
},
{
"value": "1:11.8.5-3~exp2",
"evidence": "/affected/2/versions"
},
{
"value": "1:11.8.5-3~exp3",
"evidence": "/affected/2/versions"
},
{
"value": "1:11.8.5-4",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-34303",
"aliases": [
"DEBIAN-CVE-2026-34303"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:10.11.18-0+deb12u1"
}
]
}
],
"package": {
"name": "mariadb",
"purl": "pkg:deb/debian/mariadb?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1:10.11.11-0+deb12u1",
"1:10.11.13-0+deb12u1",
"1:10.11.14-0+deb12u1",
"1:10.11.14-0+deb12u2",
"1:10.11.3-1",
"1:10.11.3-2~exp1",
"1:10.11.4-1",
"1:10.11.4-1~deb12u1",
"1:10.11.5-1",
"1:10.11.5-2",
"1:10.11.5-3",
"1:10.11.6-0+deb12u1",
"1:10.11.6-1",
"1:10.11.6-2",
"1:10.11.6-2.1~exp1",
"1:10.11.7-1",
"1:10.11.7-2",
"1:10.11.7-3",
"1:10.11.7-4",
"1:10.11.8-1",
"1:10.11.9-0+deb12u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34303.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:11.8.6-0+deb13u1"
}
]
}
],
"package": {
"name": "mariadb",
"purl": "pkg:deb/debian/mariadb?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1:11.8.2-1",
"1:11.8.3-0+deb13u1",
"1:11.8.3-1",
"1:11.8.5-1",
"1:11.8.5-2",
"1:11.8.5-3",
"1:11.8.5-3~exp1",
"1:11.8.5-3~exp2",
"1:11.8.5-3~exp3",
"1:11.8.5-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34303.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:11.8.6-1"
}
]
}
],
"package": {
"name": "mariadb",
"purl": "pkg:deb/debian/mariadb?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1:11.8.2-1",
"1:11.8.3-1",
"1:11.8.5-1",
"1:11.8.5-2",
"1:11.8.5-3",
"1:11.8.5-3~exp1",
"1:11.8.5-3~exp2",
"1:11.8.5-3~exp3",
"1:11.8.5-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34303.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:34.617661680Z",
"provider": "osv",
"upstream": [
"CVE-2026-34303"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-34303"
]
},
"related_cves": [
{
"value": "CVE-2026-34303",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 461148,
"published_at": "2026-04-21T21:16:35.547+00:00"
}