NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.
Fix
Patch, vendor advisory and mitigation references on NVD 6
- https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8 Patch
- https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736 Patch
- https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9 Patch
- https://github.com/nats-io/nats-server/pull/8163 Issue Tracking, Patch
- https://github.com/nats-io/nats-server/pull/8164 Issue Tracking, Patch
- https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f 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 7.1 · linuxfoundationNVD modified 2026-10-25 17:10
Affected (CPE criteria) 1
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
References 8
- https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8 Patch
- https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736 Patch
- https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9 Patch
- https://github.com/nats-io/nats-server/pull/8163 Issue Tracking, Patch
- https://github.com/nats-io/nats-server/pull/8164 Issue Tracking, Patch
- https://github.com/nats-io/nats-server/releases/tag/v2.12.9 Release Notes
- https://github.com/nats-io/nats-server/releases/tag/v2.14.1 Release Notes
- https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f Vendor Advisory