CVE catalog
CVE-2026-58209
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, MQTT retained message delivery and QoS1+ durable replay could deliver mes
- Severity
- Medium · CVSS 4.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.34% · Oct 25, 2026
NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.
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 |
| Cpe | nats-server | Not reported | Not reported | vulnerable |
| Cpe | nats-server | Not reported | 2.14.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | nats-server | source | sid | 2.14.3-1 | not yet assigned | Not reported | Not reported |
| Debian | nats-server | source | forky | 2.14.3-1 | 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 |
| Cpe | nats-server | cpe | Not reported | 2.14.3 | Not reported | NVD-CVE-2026-58209 | 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
nvd · nats-server · debian · bookworm; nvd · nats-server · debian · 12
2.9.10-1· all · bookwormAffected
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 · bookwormAffected
nvd · nats-server · debian · bookworm; nvd · nats-server · debian · 12
2.9.10-1+b3· arm64 · bookwormAffected
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 · trixieAffected
nvd · nats-server · debian · 13
2.10.27-1· all · trixieAffected
nvd · nats-server · debian · 13
- [nats-server]Affected
Source package: [nats-server]
Details (2)
2.10.27-1+b2· amd64 · trixieAffected
nvd · nats-server · debian · 13
2.10.27-1+b2· arm64 · trixieAffected
nvd · nats-server · debian · 13
Observed:
References
- [https://github.com/nats-io/nats-server/commit/181b1f51f40b9954c57e9d478e051fb257679356]
- [https://github.com/nats-io/nats-server/commit/1c429b6fdc5afd4188cc5faf1127f6334896cd87]
- [https://github.com/nats-io/nats-server/releases/tag/v2.12.12]
- [https://github.com/nats-io/nats-server/releases/tag/v2.14.3]
- [https://github.com/nats-io/nats-server/security/advisories/GHSA-7qmq-8cc4-hxwg]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-58209]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-58209]
- [https://security-tracker.debian.org/tracker/CVE-2026-58209]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-58209.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2132.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]