Medium severity4.3NVD Advisory· Published Jul 8, 2026· Updated Jul 13, 2026
CVE-2026-58209
CVE-2026-58209
Description
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.
Affected products
1Patches
Vulnerability mechanics
References
5- github.com/nats-io/nats-server/commit/181b1f51f40b9954c57e9d478e051fb257679356nvdPatch
- github.com/nats-io/nats-server/commit/1c429b6fdc5afd4188cc5faf1127f6334896cd87nvdPatch
- github.com/nats-io/nats-server/security/advisories/GHSA-7qmq-8cc4-hxwgnvdVendor Advisory
- github.com/nats-io/nats-server/releases/tag/v2.12.12nvdRelease Notes
- github.com/nats-io/nats-server/releases/tag/v2.14.3nvdRelease Notes
News mentions
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