CVE catalog
CVE-2026-33215
nats-server: CVE-2026-33215
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L - 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. The nats-server provides an MQTT client interface. Prior to versions 2.11.15 and 2.12.5, Sessions and Messages can by hijacked via MQTT Client ID malfeasance. Versions 2.11.15 and 2.12.5 patch the issue. 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 |
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 |
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 · bookwormAffected
dsa · nats-server · debian · bookworm; dsa · nats-server · debian · 12
2.9.10-1· all · bookwormAffected
dsa · nats-server · debian · bookworm; dsa · nats-server · debian · 12
- [nats-server]Affected
Source package: [nats-server]
Details (2)
2.9.10-1+b3· amd64 · bookwormAffected
dsa · nats-server · debian · bookworm; dsa · nats-server · debian · 12
2.9.10-1+b3· arm64 · bookwormAffected
dsa · nats-server · debian · bookworm; dsa · 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 · trixieAffected
dsa · nats-server · debian · 13
2.10.27-1· all · trixieAffected
dsa · nats-server · debian · 13
- [nats-server]Affected
Source package: [nats-server]
Details (2)
2.10.27-1+b2· amd64 · trixieAffected
dsa · nats-server · debian · 13
2.10.27-1+b2· arm64 · trixieAffected
dsa · nats-server · debian · 13
Observed:
References
- [https://github.com/advisories/GHSA-fcjp-h8cc-6879]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33215]
- [https://security-tracker.debian.org/tracker/CVE-2026-33215]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33215.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] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]