CVE-2026-58252

Description

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, an authenticated user could receive messages on denied subjects when a wildcard subscription overlapped with a configured wildcard deny rule but was not a subset of it, and queue subscriptions could also affect delivery to legitimate queue consumers. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

References

• https://github.com/nats-io/nats-server/commit/8ced85a11497f86704a95d960281480ce037386b
• https://github.com/nats-io/nats-server/commit/a42a6d1e258eb5c3a2190384d31965a4b715e854
• https://github.com/nats-io/nats-server/commit/e611ca9604697b02d8f22beb76037400a9cf72e6
• https://github.com/nats-io/nats-server/releases/tag/v2.11.16
• https://github.com/nats-io/nats-server/releases/tag/v2.12.7