CVE catalog
CVE-2026-33249
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message t
- Severity
- Medium · CVSS 6.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.24% · Oct 25, 2026
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. 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 | not affected |
| Debian | nats-server | bookworm | 2.9.10-1 | not affected |
| 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 | 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 | Not affected | unimportant | Not reported | Not reported |
| Debian | nats-server | source | bookworm | Not affected | unimportant | 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]Not affected
Source package: [nats-server]
Details (2)
2.9.10-1· all · bookwormNot affected
nvd · nats-server · debian · bookworm
2.9.10-1· all · bookwormNot affected
nvd · nats-server · debian · bookworm
- [nats-server]Not affected
Source package: [nats-server]
Details (2)
2.9.10-1+b3· amd64 · bookwormNot affected
nvd · nats-server · debian · bookworm
2.9.10-1+b3· arm64 · bookwormNot affected
nvd · nats-server · debian · bookworm
Observed:
References
- [https://github.com/advisories/GHSA-8m2x-3m6q-6w8j]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33249]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33249]
- [https://security-tracker.debian.org/tracker/CVE-2026-33249]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33249.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0858.json]
[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]