MediumFix 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 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode operator to send trace events to subjects that would not otherwise be permitted and to use trace-only behavior to prevent normal delivery or storage of affected messages. This issue is fixed in versions 2.14.3 and 2.12.8.
- 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-2026-58254
- 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 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode operator to send trace events to subjects that would not otherwise be permitted and to use trace-only behavior to prevent normal delivery or storage of affected messages. This issue is fixed in versions 2.14.3 and 2.12.8.
osv:DEBIAN-CVE-2026-58254
nats-server
Fixed versions: Not specified
nats-server
Fixed versions: Not specified
nats-server
Fixed versions: 2.14.3-1
Complete source record
{
"id": "0b0d3ce98f5e7e8564cd55b7a5d9655f38634adc3a23a2103af01885f2449479",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-58254",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-58254",
"summary": "NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode operator to send trace events to subjects that would not otherwise be permitted and to use trace-only behavior to prevent normal delivery or storage of affected messages. This issue is fixed in versions 2.14.3 and 2.12.8.",
"evidence": "osv:DEBIAN-CVE-2026-58254",
"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": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-58254",
"aliases": [
"DEBIAN-CVE-2026-58254"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
}
],
"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-2026-58254.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-2026-58254.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-2026-58254.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T12:02:37.090577153Z",
"provider": "osv",
"upstream": [
"CVE-2026-58254"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-58254"
]
},
"related_cves": [
{
"value": "CVE-2026-58254",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 452577,
"published_at": "2026-07-08T20:16:55.107+00:00"
}