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CVE-2026-33249GHSA-8M2X-3M6Q-6W8JBIT-NATS-2026-33249GO-2026-4826

NATS: Message tracing can be redirected to arbitrary subject

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 2.11.15, 2.12.6
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • nats-io nats-server

    From 2.11.0 · fixed in 2.11.15; From 2.12.0-preview.1 · fixed in 2.12.6

  • github.com/nats-io/nats-server/v2Go

    From 2.11.0 · fixed in 2.11.15

  • github.com/nats-io/nats-server/v2Go

    From 2.12.0-preview.1 · fixed in 2.12.6

  • github.com/nats-io/nats-serverGo

    All versions

  • github.com/nats-io/nats-server/v2Go

    From 2.11.0 · fixed in 2.11.15; From 2.12.0-preview.1 · fixed in 2.12.6

References 2

GitHub · nats-io/nats-server

advisories.nats.io