🛡️ CVE-2026-58210 — nats
Description
NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory
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.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.
Affected software
CVE-2026-58210 is recorded against 2 packages.
- nats
- nats-server (from 2.14.0 up to 2.14.3)
Timeline and source
Published on 14 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.
References
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Web)
nvd.nist.gov (Web)
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| nats | — | — |
| nats-server | 2.14.0 | 2.14.3 |
References
Similar Threats
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More CVE 2026 advisories
Browse all of CVE 2026 in the advisory index.
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