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Moderate severityNVD Advisory· Published Mar 25, 2026· Updated Mar 28, 2026

NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers

CVE-2026-33246

Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a Nats-Request-Info: message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/nats-io/nats-server/v2Go
< 2.11.152.11.15
github.com/nats-io/nats-server/v2Go
>= 2.12.0-RC.1, < 2.12.62.12.6
github.com/nats-io/nats-serverGo
>= 0—

Affected products

39

Patches

Vulnerability mechanics

References

4

News mentions

0

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