GitHub Advisoryadvisory · Go

GHSA-8m2x-3m6q-6w8j NATS: Message tracing can be redirected to arbitrary subject

MEDIUM Published 2026-03-24 Modified 2026-03-25 Official page ↗
Aliases
CVE-2026-33249
Ecosystem
Go
Packages
github.com/nats-io/nats-server/v2
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weaknesses
CWE-863
Reviewed
2026-03-24

Affected packages

• Go github.com/nats-io/nats-server/v2: >= 2.11.0, < 2.11.15 → fixed in 2.11.15 • Go github.com/nats-io/nats-server/v2: >= 2.12.0-preview.1, < 2.12.6 → fixed in 2.12.6

Description

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 supports telemetry on messages, using the per-message NATS headers. Problem Description 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 the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Affected Versions Any version before v2.12.6 or v2.11.15 Workarounds None.

Related

Alias · CVE (1)

  • CVE-2026-33249 NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. vulnerability

Weakness · CWE (1)

  • CWE-863 Incorrect Authorization weakness

References