CVE catalog

CVE-2026-33223

Severity: Medium · CVSS 6.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Published: Mar 24, 2026, 11:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.21% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	nats-server	sid	`2.15.1-1`	fixed
Debian	nats-server	forky	`2.15.1-1`	fixed
Debian	nats-server	trixie	`2.10.27-1`	vulnerable
Debian	nats-server	bookworm	`2.9.10-1`	vulnerable
Go	github.com/nats-io/nats-server/v2	Not reported	`2.11.15`	fixed
Go	github.com/nats-io/nats-server/v2	Not reported	`2.12.6`	fixed
Cpe	nats-server	Not reported	Not reported	vulnerable
Cpe	nats-server	Not reported	`2.11.15`	fixed
Cpe	nats-server	Not reported	`2.12.6`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	nats-server	source	sid	`2.12.6-1`	not yet assigned	Not reported	Not reported
Debian	nats-server	source	forky	`2.12.6-1`	not yet assigned	Not reported	Not reported
Debian	nats-server	source	trixie	`(unfixed)`	not yet assigned	Not reported	Not reported
Debian	nats-server	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported
Go	github.com/nats-io/nats-server/v2	go	Not reported	`2.11.15`	Not reported	Not reported	Not reported
Go	github.com/nats-io/nats-server/v2	go	Not reported	`2.12.6`	Not reported	Not reported	Not reported
Cpe	nats-server	cpe	Not reported	`2.11.15`	Not reported	Not reported	Not reported
Cpe	nats-server	cpe	Not reported	`2.12.6`	Not reported	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[golang-github-nats-io-nats-server-dev]Affected
Source package: [nats-server]
Details (2)
- 2.9.10-1 · all · bookworm
  Affected
  nvd · nats-server · debian · bookworm; nvd · nats-server · debian · 12
- 2.9.10-1 · all · bookworm
  Affected
  nvd · nats-server · debian · bookworm; nvd · nats-server · debian · 12
[nats-server]Affected
Source package: [nats-server]
Details (2)
- 2.9.10-1+b3 · amd64 · bookworm
  Affected
  nvd · nats-server · debian · bookworm; nvd · nats-server · debian · 12
- 2.9.10-1+b3 · arm64 · bookworm
  Affected
  nvd · nats-server · debian · bookworm; nvd · nats-server · debian · 12

[Debian 13 (Trixie)]

[golang-github-nats-io-nats-server-dev]Affected
Source package: [nats-server]
Details (2)
- 2.10.27-1 · all · trixie
  Affected
  nvd · nats-server · debian · 13
- 2.10.27-1 · all · trixie
  Affected
  nvd · nats-server · debian · 13
[nats-server]Affected
Source package: [nats-server]
Details (2)
- 2.10.27-1+b2 · amd64 · trixie
  Affected
  nvd · nats-server · debian · 13
- 2.10.27-1+b2 · arm64 · trixie
  Affected
  nvd · nats-server · debian · 13

Observed: Oct 23, 2026, 10:39:00 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]