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BIT-nats-2026-33247 — NATS credentials are exposed in monitoring port via command-line argv

Affected: Bitnami: nats

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 that too is enabled. The `/debug/vars` end-point contains an unredacted copy of argv. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, configure credentials inside a configuration file instead of via argv, and do not enable the monitoring port if using secrets in argv. Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources.

CLEANSTART-2026-QU10811 — Security fix for CVE-2026-33247 applied in: nats-server-fips 2.12.5-r1

Affected: CleanStart: nats-server-fips

Security vulnerability affects the nats-server-fips package. This issue is resolved in later releases. See references for vulnerability details.

EUVD-2026-365484

fkie_cve-2026-33247

GHSA-x6g4-f6q3-fqvv — NATS credentials are exposed in monitoring port via command-line argv

Affected: Go: github.com/nats-io/nats-server/v2

### 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 provides an optional monitoring port, which provides access to sensitive data. The nats-server can take certain configuration options on the command-line instead of requiring a configuration file.

### Problem Description

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 that too is enabled.

The `/debug/vars` end-point contains an unredacted copy of argv.

### Patches

Fixed in nats-server 2.12.6 & 2.11.15

### Workarounds

The NATS Maintainers are bemused at the concept of someone deploying a real configuration using `--pass` to avoid a config file, but also enabling monitoring.

Configure credentials inside a configuration file instead of via argv.

Do not enable the monitoring port if using secrets in argv.

Best practice remains to not expose the monitoring port to the Internet, or to untrusted network sources.

RHSA-2026:21769 — Red Hat Security Advisory: Multicluster Global Hub 1.5.4 security update

grafana/tempo: Tempo: Denial of Service via large queries net/url: Incorrect parsing of IPv6 host literals in net/url crypto/x509: Incorrect enforcement of email constraints in crypto/x509 github.com/nats-io/nats-server: NATS-Server: Denial of Service via malformed WebSockets frame github.com/nats-io/nats-server: NATS-Server: Denial of Service via leafnode compression crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages github.com/buger/jsonparser: github.com/buger/jsonparser: Denial of Service via malformed JSON input github.com/jackc/pgproto3/v2: github.com/jackc/pgproto3/v2: Denial of Service via malicious PostgreSQL server google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation nats-server: NATS-Server: Session and message hijacking via MQTT Client ID malfeasance nats-server: github.com/nats-io/nats-server: NATS-Server: Information disclosure of MQTT passwords through monitoring endpoints nats-server: github.com/nats-io/nats-server: NATS-Server: Access control bypass via unapplied ACLs in MQTT namespace nats-server: github.com/nats-io/nats-server: NATS-Server: Denial of Service via mal…

UBUNTU-CVE-2026-33247

Affected: Ubuntu:24.04:LTS: nats-server, Ubuntu:25.10: nats-server, Ubuntu:Pro:26.04:LTS: nats-server

WID-SEC-W-2026-0858 — NATS Server: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in NATS Server ausnutzen, um Informationen offenzulegen oder zu manipulieren, einen Denial-of-Service zu verursachen und Sicherheitsmechanismen zu umgehen.