Bug 2498259 (CVE-2026-58209) - CVE-2026-58209 nats-server: NATS Server: Information disclosure due to inconsistent MQTT topic rechecking
Summary: CVE-2026-58209 nats-server: NATS Server: Information disclosure due to incons...
Keywords:
Status: NEW
Alias: CVE-2026-58209
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-08 21:02 UTC by OSIDB Bzimport
Modified: 2026-08-24 12:14 UTC (History)
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Description OSIDB Bzimport 2026-07-08 21:02:36 UTC 
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.
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