NATS: Message tracing can be redirected to arbitrary subject
Summary
NATS: Message tracing can be redirected to arbitrary subject
Original description
The description as published by the source.
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 the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-33249 nats-server Fixed in: 2.12.6-1
- Ubuntu UBUNTU-CVE-2026-33249 nats-server
References
- advisory advisories.nats.io
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com