Moderate severityNVD Advisory· Published Mar 25, 2026· Updated Mar 26, 2026
NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing
CVE-2026-33223
Description
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, the NATS message header Nats-Request-Info: is supposed to be a guarantee of identity by the NATS server, but the stripping of this header from inbound messages was not fully effective. An attacker with valid credentials for any regular client interface could thus spoof their identity to services which rely upon this header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/nats-io/nats-server/v2Go | < 2.11.15 | 2.11.15 |
github.com/nats-io/nats-server/v2Go | >= 2.12.0-RC.1, < 2.12.6 | 2.12.6 |
github.com/nats-io/nats-serverGo | >= 0 | — |
Affected products
1- Range: < 2.11.15
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- github.com/advisories/GHSA-pwx7-fx9r-hr4hghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-33223ghsaADVISORY
- advisories.nats.io/CVE/secnote-2026-09.txtghsax_refsource_MISCWEB
- github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4hghsax_refsource_CONFIRMWEB
News mentions
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