Resource exhaustion in Linuxfoundation Nats-Server
CVE-2026-58210
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 unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (53.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Linuxfoundation Nats-Server
- Nats-Io Nats-Server — versions < 2.12.12, >= 2.14.0-RC.1, < 2.14.3
Weakness classification (CWE)
References
- github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861 (Patch)
- github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5 (Patch)
- github.com/nats-io/nats-server/releases/tag/v2.12.12 (Release Notes)
- github.com/nats-io/nats-server/releases/tag/v2.14.3 (Release Notes)
- github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-58210?
- CVE-2026-58210 is a high-severity vulnerability in Linuxfoundation Nats-Server, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-07-08.
- How severe is CVE-2026-58210?
- High severity. CVSS v3 base score is 7.5 out of 10.