CVE-2026-33246
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system.
Published Mar 25, 2026 · updated Jun 17, 2026 · linuxfoundation nats-server
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a 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.
Code
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Timeline
Detection, updates, and resolution for this record.
Mar 25, 2026 · NIST NVD
Detected
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a 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.
Jun 17, 2026 · NIST NVD
Updated
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a 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.
Affected
- cpe linuxfoundation/nats-serverversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-33246
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-33246
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a message header, providing information about a request. This is supposed to provide enough information to allow for account/user identifica
nvd.nist.gov