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CVE-2026-33218
7.5 HIGH
- CVSS version: 3.1
- Attack vector (AV): NETWORK
- Attack complexity (AC): LOW
- Privileges required (PR): NONE
- User interaction (UI): NONE
- Scope (S): UNCHANGED
- Confidentiality impact (C): NONE
- Integrity impact (I): NONE
- Availability impact (A): HIGH
NATS has pre-auth server panic via leafnode handling
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable leafnode support if not needed or restrict network connections to the leafnode port, if plausible without compromising the service offered.
References
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https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339 x_refsource_CONFIRM
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https://advisories.nats.io/CVE/secnote-2026-10.txt x_refsource_MISC
Affected products
nats-server
- ==< < 2.11.15
- ==>= 2.12.0-RC.1, < 2.12.6
Package maintainers
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@derekcollison Derek Collison <derek@nats.io>
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@swdunlop Scott W. Dunlop <swdunlop@gmail.com>