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.

References

https://github.com/nats-io/nats-server/security/advisories/GHSA-pwx7-fx9r-hr4h

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-15996

https://advisories.nats.io/CVE/secnote-2026-09.txt

Details

Source: Mitre, NVD

Named Vulnerability: GO-2026-4835Named Vulnerability: GHSA-pwx7-fx9r-hr4h

Risk Information

CVSS v2

CVSS v3

EPSS