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CVE-2026-58253

HIGH
8.8
CVSS 3.1
Description
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

Metadata

CVE ID
CVE-2026-58253
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-29 21:54 UTC
Published
2026-07-08 19:43 UTC
Last updated
2026-07-09 13:35 UTC
Primary CWE
CWE-287
CWE-287: Improper Authentication
Vendor / Product
nats-io / nats-server
Sources
cve.org  ·  NVD

Severity & Metrics

8.8 HIGH CVSS 3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
nats-io nats-server — < 2.11.16, >= 2.12.0-preview.1, < 2.12.6
Weakness (CWE)
CWESourceDescription
CWE-287 cna CWE-287: Improper Authentication
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.8 HIGH 3.1 cna CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L
References (7)
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