Medium
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, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.
- Products
- nats-server
- Affected versions
- 2.10.24-1, 2.10.27-1, 2.10.27-1build1, 2.10.27-1ubuntu0.26.04.1~esm1, 2.10.3-1, 2.10.4-1, 2.10.7-1, 2.10.7-1ubuntu0.1, 2.10.7-1ubuntu0.2, 2.10.7-1ubuntu0.3, 2.14.1-1, 2.14.3-1, 2.9.19-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-58209
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:47 UTC · Revision 1
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, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.
osv:UBUNTU-CVE-2026-58209
nats-server
Fixed versions: Not specified
nats-server
Fixed versions: Not specified
nats-server
Fixed versions: Not specified
nats-server
Fixed versions: Not specified
Complete source record
{
"id": "7e3d7dd91e39e6b92e7e0abdf402a6b648b6b04b4ebda50b58e9fa9bd56ad4a3",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-58209",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-58209",
"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, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.",
"evidence": "osv:UBUNTU-CVE-2026-58209",
"products": [
{
"name": {
"value": "nats-server",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.9.19-1build1",
"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": "2.10.7-1ubuntu0.1",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.7-1ubuntu0.2",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.7-1ubuntu0.3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "nats-server",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.10.24-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.10.27-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "nats-server",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.10.27-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "2.14.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "2.14.3-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "nats-server",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.10.27-1",
"evidence": "/affected/3/versions"
},
{
"value": "2.10.27-1build1",
"evidence": "/affected/3/versions"
},
{
"value": "2.10.27-1ubuntu0.26.04.1~esm1",
"evidence": "/affected/3/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-58209",
"aliases": [
"UBUNTU-CVE-2026-58209"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nats-server",
"purl": "pkg:deb/ubuntu/nats-server?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"2.9.19-1build1",
"2.10.3-1",
"2.10.4-1",
"2.10.7-1",
"2.10.7-1ubuntu0.1",
"2.10.7-1ubuntu0.2",
"2.10.7-1ubuntu0.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58209.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-nats-io-nats-server-dev",
"binary_version": "2.10.7-1ubuntu0.3"
},
{
"binary_name": "nats-server",
"binary_version": "2.10.7-1ubuntu0.3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nats-server",
"purl": "pkg:deb/ubuntu/nats-server?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"2.10.24-1",
"2.10.27-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58209.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-nats-io-nats-server-dev",
"binary_version": "2.10.27-1"
},
{
"binary_name": "nats-server",
"binary_version": "2.10.27-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nats-server",
"purl": "pkg:deb/ubuntu/nats-server?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"2.10.27-1build1",
"2.14.1-1",
"2.14.3-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58209.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-nats-io-nats-server-dev",
"binary_version": "2.14.3-1"
},
{
"binary_name": "nats-server",
"binary_version": "2.14.3-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nats-server",
"purl": "pkg:deb/ubuntu/nats-server?arch=source&distro=esm-apps%2Fresolute",
"ecosystem": "Ubuntu:Pro:26.04:LTS"
},
"versions": [
"2.10.27-1",
"2.10.27-1build1",
"2.10.27-1ubuntu0.26.04.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-58209.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-nats-io-nats-server-dev",
"binary_version": "2.10.27-1ubuntu0.26.04.1~esm1"
},
{
"binary_name": "nats-server",
"binary_version": "2.10.27-1ubuntu0.26.04.1~esm1"
}
]
}
}
],
"modified": "2026-10-17T12:59:12.642663930Z",
"provider": "osv",
"upstream": [
"CVE-2026-58209"
],
"references": [
"https://ubuntu.com/security/CVE-2026-58209",
"https://www.cve.org/CVERecord?id=CVE-2026-58209",
"https://github.com/nats-io/nats-server/security/advisories/GHSA-7qmq-8cc4-hxwg"
]
},
"related_cves": [
{
"value": "CVE-2026-58209",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359436,
"published_at": "2026-07-08T20:16:00+00:00"
}