CVE-2026-29785High· 7.5▾ TwilightNATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the "leafnode" configuration enabled (not default), then anyone who can connect …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Jul 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.7%
Last analysed / modified upstream
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the "leafnode" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port.
nats-server < 2.11.14nats-server >= 2.12.0, < 2.12.5Upgrade past the affected range:
nats-server 2.12.5Affected packages:
github.com/nats-io/nats-server/v2 < 2.11.14github.com/nats-io/nats-server/v2 >= 2.12.0-RC.1, < 2.12.5github.com/nats-io/nats-serverPatched in:
github.com/nats-io/nats-server/v2 2.11.14github.com/nats-io/nats-server/v2 2.12.5Connected by shared product, vendor, weakness, or advisory.
CVE-2026-33247High· 7.4NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system
CVE-2026-33219Medium· 5.3NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system
CVE-2026-33218High· 7.5NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system
CVE-2026-33217High· 7.1NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system
CVE-2026-33216High· 8.6NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system
CVE-2026-27889High· 7.5NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system