CVE-2026-33219 NATS is vulnerable to pre-auth DoS through WebSockets client service

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...

CVE-2026-33218 NATS has pre-auth server panic via leafnode handling

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 ...

CVE-2026-33218

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 ...

CVE-2026-33218 NATS has pre-auth server panic via leafnode handling

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 ...

CVE-2026-33218

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 ...

CVE-2026-29785 NATS Server panic via malicious compression on leafnode port

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...

CVE-2026-29785 NATS Server panic via malicious compression on leafnode port

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...

CVE-2026-29785

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...

CVE-2026-29785

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...

CVE-2026-29785

CVE-2026-29785 affects the NATS-Server (NATS.io) prior to versions 2.11.14 and 2.12.5. When leafnode is enabled (not default) and compression is enabled (default with leafnodes), an unauthenticated attacker who can connect can crash the server by triggering a panic. The condition is pre-authentic...

CVE-2026-27889

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...

CVE-2026-33218: Improper Input Validation

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 ...

CVE-2026-29785: NULL Pointer Dereference

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...

PT-2026-28092

Name of the Vulnerable Software and Affected Versions NATS-Server versions 2.2.0 through 2.11.14 NATS-Server versions 2.12.0 through 2.12.5 Description NATS-Server, a high-performance messaging system, has a flaw where a missing sanity check on WebSocket frames can cause the server to panic. This...

GHSA-8R68-GVR4-JH7J NATS is vulnerable to pre-auth DoS through WebSockets client service

Background NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing. The nats-server offers a WebSockets client service, used in deployments where browsers are the NATS clients. Problem Description A malicious...

NATS has pre-auth server panic via leafnode handling

Background NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing. The nats-server allows hub/spoke topologies using "leafnode" connections by other nats-servers. Problem Description A client which can conne...

GHSA-52JH-2XXH-PWH6 NATS Server panic via malicious compression on leafnode port

Background NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing. When configured to accept leafnode connections for a hub/spoke topology of multiple nats-servers, then the default configuration allows for...

CLSA-2026-1774366569 Fix CVE(s): CVE-2026-3497

SECURITY UPDATE: pre-auth crash via GSSAPI key exchange - debian/patches/CVE-2026-3497.patch: replace sshpktdisconnect with sshpacketdisconnect and initialize gssbufferdesc variables in kexgssc.c, kexgsss.c. - CVE-2026-3497...

PT-2026-27612

Name of the Vulnerable Software and Affected Versions NATS-Server versions prior to 2.11.14 NATS-Server versions prior to 2.12.5 Description NATS-Server, a high-performance messaging system, is susceptible to a server panic when configured as a leafnode. This occurs pre-authentication and require...

CVE-2026-32969

An unauthenticated remote attacker can exploit a Pre-Auth blind SQL Injection vulnerability in the userinfo endpoint’s authentication method due to improper neutralization of special elements in a SQL SELECT command. This can result in a total loss of confidentiality...