CVE-2026-33223

unknown

Published 2026-03-24 · Modified 2026-03-27

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CVSS v3

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CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS v4 NEW

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not yet in upstream

VIR risk

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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.

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

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OS impact

OS	Version	Status	Fixed in
sles		affected
debian	bookworm	affected
debian	forky	fixed	`2.12.6-1`
debian	sid	fixed	`2.12.6-1`
debian	trixie	affected

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	github.com/nats-io/nats-server/v2	`<2.11.15`	`2.11.15`
Go	github.com/nats-io/nats-server/v2	`>=2.12.0-RC.1,<2.12.6`	`2.12.6`
Go	github.com/nats-io/nats-server

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.