Bug 2499584

Summary:	CVE-2026-58253 golang-github-nats-io-streaming-server: NATS Server: Authentication bypass and privilege escalation via parser fast path [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Jeremy Choi <jechoi>
Component:	golang-github-nats-io-streaming-server	Assignee:	Orphan Owner <extras-orphan>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	45	CC:	extras-orphan, go-sig
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["72396b04-3129-4f13-beb9-e5ed80214c16"]}
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2498261

Description Jeremy Choi 2026-07-13 05:47:31 UTC

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 type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

Comment 1 Aoife Moloney 2026-08-17 15:18:41 UTC

This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.