Bug 2451485 (CVE-2026-33249) - CVE-2026-33249 github.com/nats-io/nats-server: NATS-Server: Unauthorized trace message redirection via message tracing headers
Summary: CVE-2026-33249 github.com/nats-io/nats-server: NATS-Server: Unauthorized trac...
Keywords:
Status: NEW
Alias: CVE-2026-33249
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2451504
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-25 21:02 UTC by OSIDB Bzimport
Modified: 2026-03-25 21:29 UTC (History)
5 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-03-25 21:02:21 UTC 
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.
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