HighFix available
nats-server — security advisory
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.
- Products
- nats-server
- Affected versions
- 2.10.1-1, 2.10.16-1, 2.10.18-1, 2.10.24-1, 2.10.27-1, 2.10.3-1, 2.10.4-1, 2.10.7-1, 2.12.4-1, 2.12.6-1, 2.14.1-1, 2.14.3-1, 2.14.6-1, 2.15.1-1, 2.9.10-1, 2.9.19-1
- Fixed versions
- 2.14.3-1
- CVEs
- CVE-2026-58210
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 13:35 UTC · Revision 2
Source evidence
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.
osv:DEBIAN-CVE-2026-58210
nats-server
Fixed versions: Not specified
nats-server
Fixed versions: Not specified
nats-server
Fixed versions: 2.14.3-1
Complete source record
{
"id": "434a5f6cde4f378c5aaa10fe5ed710b0e017988c465465e05a9c1c2ef8251492",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-58210",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-58210",
"summary": "NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.",
"evidence": "osv:DEBIAN-CVE-2026-58210",
"products": [
{
"name": {
"value": "nats-server",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.10.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.16-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.18-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.24-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.27-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.7-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.12.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.12.6-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.14.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.14.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.14.6-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.15.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.10-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.19-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "nats-server",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.10.27-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.12.4-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.12.6-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.14.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.14.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.14.6-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.15.1-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "nats-server",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.14.3-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "2.10.27-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.12.4-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.12.6-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.14.1-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-58210",
"aliases": [
"DEBIAN-CVE-2026-58210"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nats-server",
"purl": "pkg:deb/debian/nats-server?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.10.1-1",
"2.10.16-1",
"2.10.18-1",
"2.10.24-1",
"2.10.27-1",
"2.10.3-1",
"2.10.4-1",
"2.10.7-1",
"2.12.4-1",
"2.12.6-1",
"2.14.1-1",
"2.14.3-1",
"2.14.6-1",
"2.15.1-1",
"2.9.10-1",
"2.9.19-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58210.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nats-server",
"purl": "pkg:deb/debian/nats-server?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.10.27-1",
"2.12.4-1",
"2.12.6-1",
"2.14.1-1",
"2.14.3-1",
"2.14.6-1",
"2.15.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58210.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.14.3-1"
}
]
}
],
"package": {
"name": "nats-server",
"purl": "pkg:deb/debian/nats-server?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.10.27-1",
"2.12.4-1",
"2.12.6-1",
"2.14.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58210.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T12:02:37.232315048Z",
"provider": "osv",
"upstream": [
"CVE-2026-58210"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-58210"
]
},
"related_cves": [
{
"value": "CVE-2026-58210",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 452573,
"published_at": "2026-07-08T20:16:53.95+00:00"
}