CVE-2026-58214NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system.
Updated under an hour ago ()
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It affects linuxfoundation nats-server. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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, an authenticated MQTT client could subscribe to the internal $MQTT.deliver.pubrel subject family, bypassing configured subscribe permissions and exposing MQTT QoS2 protocol metadata for sessions in the account. This issue is fixed in versions 2.14.3 and 2.12.12.
- CVSS
- 4.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 13, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
linuxfoundation nats-server linuxfoundation:nats-server | before 2.12.12; from 2.14.0 before 2.14.3 | NVD |
References
- https://github.com/nats-io/nats-server/commit/297b166be60fe13144084eed4b25201ead03204apatch
- https://github.com/nats-io/nats-server/commit/34b09657bb596d5f850eaa5cfc97ea6b2f989a97patch
- https://github.com/nats-io/nats-server/releases/tag/v2.12.12release-notes
- https://github.com/nats-io/nats-server/releases/tag/v2.14.3release-notes
- https://github.com/nats-io/nats-server/security/advisories/GHSA-4g68-3pwx-5vfjvendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.