CVE-2026-58253
published 2026-07-08CVE-2026-58253: 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…
PriorityP355high8.8CVSS 3.1
AVAACLPRNUINSCCLIHAL
EPSS
0.37%
29.7th percentile
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.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linuxfoundation | nats-server | < 2.11.16 | 2.11.16 |
| linuxfoundation | nats-server | >= 2.12.0 < 2.12.7 | 2.12.7 |
| nats-io | nats-server | < 2.11.16 | 2.11.16 |
| nats-io | nats-server | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L
vendor_redhat8.8HIGH
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Bugzilla
CVE-2026-58253 golang-github-nats-io-streaming-server: NATS Server: Authentication bypass and privilege escalation via parser fast path [fedora-all]
bugzilla·2026-07-13·CVSS 8.8
CVE-2026-58253 [HIGH] CVE-2026-58253 golang-github-nats-io-streaming-server: NATS Server: Authentication bypass and privilege escalation via parser fast path [fedora-all]
CVE-2026-58253 golang-github-nats-io-streaming-server: NATS Server: Authentication bypass and privilege escalation via parser fast path [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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 typ
Bugzilla
CVE-2026-58253 github.com/nats-io/nats-server: NATS Server: Authentication bypass and privilege escalation via parser fast path
bugzilla·2026-07-08·CVSS 8.8
CVE-2026-58253 [HIGH] CVE-2026-58253 github.com/nats-io/nats-server: NATS Server: Authentication bypass and privilege escalation via parser fast path
CVE-2026-58253 github.com/nats-io/nats-server: NATS Server: Authentication bypass and privilege escalation via parser fast path
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.
https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3https://github.com/nats-io/nats-server/releases/tag/v2.11.16https://github.com/nats-io/nats-server/releases/tag/v2.12.7https://github.com/nats-io/nats-server/releases/tag/v2.14.0https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45
2026-07-08
Published