CVE-2026-58210

EUVD-2026-42348
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 41.17%
Affected Products (NVD)
VendorProductVersion
linuxfoundationnats-server
𝑥
< 2.12.12
linuxfoundationnats-server
2.14.0 ≤
𝑥
< 2.14.3
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
nats-server
bookworm
vulnerable
forky
2.14.3-1
fixed
sid
2.14.3-1
fixed
trixie
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
nats-server
jammy
dne
noble
needs-triage
questing
ignored
resolute
needs-triage
Common Weakness Enumeration
References
https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861
https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5
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-r72h-j7qq-v6qg