CVE-2023-46129

CVE-2023-46129 describes a crypto bug in the nkeys library used by NATS. In nkeys versions 0.4.0–0.4.5 (aligned with NATS server 2.10.0–2.10.3), the xkeys encryption handling logic accidentally passed an array by value to an internal function that mutated the buffer to supply the encryption key. ...

CVE-2023-47090

CVE-2023-47090 : The NATS nats-server authentication bypass affects 2.9.23 and 2.10.x before 2.10.2; an implicit "$G" user in an authorization block can allow unauthenticated access, even if accounts exist. Earliest affected version is 2.2.0. The connected IBM / OSS advisories confirm the vulnera...

CVE-2022-24450

CVE-2022-24450 affects NATS nats-server up to and including 2.7.1, with a root cause in an experimental feature for dynamically provisioned sandbox accounts that allowed any authenticated user to switch into any account, including the System account. The impact is high (privilege escalation and f...

CVE-2022-26652

Summary: CVE-2022-26652 affects NATS nats-server (up to 2.7.3) and nats-streaming-server (up to 0.24.2). The issue is a directory traversal (“Zip Slip”) via an element in a ZIP archive used in JetStream streams, allowing potentially arbitrary file write. The root cause is insufficient sanitizatio...

CVE-2021-3127

The CVE concerns NATS Server 2.x (pre-2.2.0) and the JWT library (pre-2.0.1) where Import Token bindings were mishandled, causing Incorrect Access Control. The root cause is improper validation of Import Token bindings, allowing cross-account access to imported subjects. Affected versions include...

CVE-2020-26521

CVE-2020-26521 affects NATS server’s JWT handling: the JWT library (used by nats-server) can dereference nil during decoding, causing Denial of Service. Affected: NATS Server versions before 2.1.9. Root cause: nil dereference in Go code when processing User JWTs. Remediation: upgrade the JWT depe...

CVE-2020-26892

Summary : CVE-2020-26892 affects NATS nats-server before 2.1.9 due to incorrect access control from how expired credentials are handled in the JWT library. The vulnerability stems from the JWT package’s credential expiry checks, which could allow bypassing access restrictions. Affected versions i...

CVE-2020-28466

CVE-2020-28466 affects the nats-server component at github.com/nats-io/nats-server/server. The issue arises from an export/import cycle between accounts that untrusted users can trigger, causing the server to crash (denial of service) by consuming CPU/memory. Connected advisories indicate the 2.x...

CVE-2022-28357

CVE-2022-28357 affects NATS nats-server; versions 2.2.0–2.7.4 allow directory traversal via an unintended path to a management action from a management account. Connected sources (OSV, NVD, GHSA, Fedora/Nessus/OpenVAS) corroborate the issue. The impact is described as directory traversal, with hi...

CVE-2019-13126

CVE-2019-13126 is an integer overflow in the NATS Server prior to 2.0.2 that allows a remote attacker to crash the server by sending a crafted request; if authentication is enabled, the attacker must have authenticated first. Public notices extend risk to later versions (e.g., GHSA references for...

CVE-2026-33215

CVE-2026-33215 affects NATS-Server (NATS.io) where the MQTT client interface allows hijacking of Sessions and Messages due to MQTT Client ID malfeasance. Affected versions are prior to 2.11.15 and 2.12.5; these versions patch the issue. The description does not provide exploit details or how atta...

CVE-2026-27889

CVE-2026-27889 pertains to the NATS server when WebSockets are enabled. A pre-authentication remote crash can be triggered by a crafted WebSocket frame with a 64-bit extended payload length MSB set, which causes a signed/unsigned handling issue and results in an unrecovered panic, terminating the...

CVE-2026-27571

NATS-Server WebSockets handling is vulnerable to a pre-auth memory DoS via a compression bomb. Prior to v2.11.2 and v2.12.3, memory bounds for a NATS message were not independently applied to the memory stream, allowing excessive memory consumption and potential OS termination. The issue is explo...

CVE-2026-33222

NATS-Server (JetStream) contains an authorization bypass via the JetStream management API: users with JetStream admin API access to restore one stream could restore to other stream names, risking data overwrite across streams. Affected versions are prior to 2.11.15 and 2.12.6. The fixed releases ...

CVE-2026-33247

CVE-2026-33247 affects the NATS-Server (NATS.io). Prior to versions 2.11.15 and 2.12.6, running nats-server with static credentials provided via argv causes those credentials to be visible to any user who can see the monitoring port; the /debug/vars endpoint exposes an unredacted argv. A fix is a...

CVE-2026-33217

CVE-2026-33217 affects NATS-Server prior to versions 2.11.15 and 2.12.6, where ACLs on message subjects were not applied in the $MQTT.> namespace, letting MQTT clients bypass ACL checks for MQTT subjects. Root cause: ACLs not enforced in that namespace. Impact: potential unauthorized access/by...

CVE-2026-33219

CVE-2026-33219 affects NATS-Server web sockets handling. A malicious client that connects to the WebSockets port can trigger unbounded memory growth before authentication by sending a大量 amount of data. Affected versions are prior to 2.11.15 and 2.12.6; a fix is available in 2.11.15 and 2.12.6. Th...

CVE-2026-33218

CVE-2026-33218 affects NATS-Server. Prior to versions 2.11.15 and 2.12.6, a client able to reach the leafnode port can crash the server with a specially malformed message before authentication. Versions 2.11.15 and 2.12.6 include a fix. Affected product: NATS-Server (leafnode handling). Root caus...

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-2026-33216

Impactful CVE-2026-33216 (NATS-Server) : In MQTT deployments using usercodes/passwords, passwords are incorrectly classified as a non-authenticating identity statement (JWT) and exposed through monitoring endpoints. Affected versions are prior to 2.11.15 and 2.12.6; fixes are in 2.11.14 and 2.12....

CVE-2026-33249

NATS-Server vulnerability CVE-2026-33249 affects versions 2.11.0 through 2.11.14 and 2.12.0 through 2.12.5. A valid client using message tracing headers can cause trace messages to be sent to an arbitrary valid subject, including subjects the client cannot publish to; the payload is a valid trace...

CVE-2026-33223

CVE-2026-33223 affects NATS-Server. Prior to versions 2.11.15 and 2.12.6, the Nats-Request-Info header, intended to guarantee identity, could still be stripped incompletely from inbound messages, allowing an attacker with valid credentials to spoof identity to services relying on that header. The...

CVE-2026-33246

CVE-2026-33246 affects the NATS-Server (NATS.io). The issue is that the Nats-Request-Info: header used for identity could be spoofed when a leafnode connects to a nats-server, potentially enabling identity claims to be misrepresented. The root cause is header spoofing in leafnode connections; the...

CVE-2026-33248

NATS-Server has an authentication bypass vulnerability in mTLS verify_and_map where certain RDN patterns in the client certificate Subject DN were not correctly enforced. A valid certificate from a trusted CA could bypass identity checks on versions prior to 2.11.15 and 2.12.6. The issue is consi...