| CVE-2026-33249 | MOYENNE4.3 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which | 25/03/2026 |
| CVE-2026-33248 | MOYENNE4.2 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with `verify_and_map` to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be correctly enforced, al | 25/03/2026 |
| CVE-2026-33223 | MOYENNE5.4 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, the NATS message header `Nats-Request-Info:` is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective. | 25/03/2026 |
| CVE-2026-33222 | MOYENNE4.9 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, users with JetStream admin API access to restore one stream could restore to other stream names, impacting data which should have been protected against them. Versions 2.11.15 and 2.12.6 | 25/03/2026 |
| CVE-2026-33247 | MOYENNE5.3 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, if a nats-server is run with static credentials for all clients provided via argv (the command-line), then those credentials are visible to any user who can see the monitoring port, if t | 25/03/2026 |
| CVE-2026-33246 | MOYENNE5.4 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a `Nats-Request-Info:` message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make | 25/03/2026 |
| CVE-2026-33219 | MOYENNE5.3 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data. | 25/03/2026 |
| CVE-2026-33218 | ÉLEVÉE7.5 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, | 25/03/2026 |
| CVE-2026-33217 | MOYENNE6.5 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using ACLs on message subjects, these ACLs were not applied in the `$MQTT.>` namespace, allowing MQTT clients to bypass ACL checks for MQTT subjects. Versions 2.11.15 and 2.12.6 con | 25/03/2026 |
| CVE-2026-33216 | ÉLEVÉE7.5 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, for MQTT deployments using usercodes/passwords: MQTT passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed via monitoring endpoints. Versions | 25/03/2026 |
| CVE-2026-29785 | ÉLEVÉE7.5 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the "leafnode" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication an | 25/03/2026 |
| CVE-2026-27889 | ÉLEVÉE7.5 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyo | 25/03/2026 |
| CVE-2026-33215 | MOYENNE6.5 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server provides an MQTT client interface. Prior to versions 2.11.15 and 2.12.5, Sessions and Messages can by hijacked via MQTT Client ID malfeasance. Versions 2.11.15 and 2.12.5 patch the issue. No known workarounds | 24/03/2026 |
| CVE-2026-27571 | ÉLEVÉE7.5 | NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The WebSockets handling of NATS messages handles compressed messages via the WebSockets negotiated compression. Prior to versions 2.11.2 and 2.12.3, the implementation bound the memory size of a NATS message but did not inde | 24/02/2026 |
| GO-2022-0398 | — | Import loops in account imports, nats-server DoS in github.com/nats-io/nats-server | 21/08/2024 |
| CVE-2022-29946 | MOYENNE6.3 | NATS.io NATS Server before 2.8.2 and Streaming Server before 0.24.6 could allow a remote attacker to bypass security restrictions, caused by the failure to enforce negative user permissions in one scenario. By using a queue subscription on the wildcard, an attacker could exploit this vulnerability to allow denied subje | 11/07/2024 |
| CVE-2021-32026 | — | NATS server TLS missing ciphersuite settings when CLI flags used in github.com/nats-io/nats-server | 05/06/2024 |
| CVE-2022-28357 | CRITIQUE9.8 | NATS nats-server 2.2.0 through 2.7.4 allows directory traversal because of an unintended path to a management action from a management account. | 19/09/2023 |
| CVE-2022-26652 | MOYENNE6.5 | NATS nats-server before 2.7.4 allows Directory Traversal (with write access) via an element in a ZIP archive for JetStream streams. nats-streaming-server before 0.24.3 is also affected. | 10/03/2022 |
| CVE-2022-24450 | ÉLEVÉE8.8 | NATS nats-server before 2.7.2 has Incorrect Access Control. Any authenticated user can obtain the privileges of the System account by misusing the "dynamically provisioned sandbox accounts" feature. | 08/02/2022 |