CVE-2026-33223
low-risk
Published 2026-03-25
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.
Do I need to act?
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0.03% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.4/10
Medium
NETWORK
/ LOW complexity
Affected Products (1)
Affected Vendors
References (2)
Vendor Advisory
https://advisories.nats.io/CVE/secnote-2026-09.txt
29
/ 100
low-risk
Severity
24/34 · High
Exploitability
0/34 · Minimal
Exposure
5/34 · Minimal