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, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861 Patch
- https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5 Patch
- https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · linuxfoundationNVD modified 2026-10-25 17:10
Affected (CPE criteria) 1
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
References 5
- https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861 Patch
- https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5 Patch
- https://github.com/nats-io/nats-server/releases/tag/v2.12.12 Release Notes
- https://github.com/nats-io/nats-server/releases/tag/v2.14.3 Release Notes
- https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg Vendor Advisory