Upstream information

CVE-2026-27889 at MITRE

Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

SUSE information

Overall state of this security issue: Does not affect SUSE products

SUSE Bugzilla entry: 1260812 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References

SUSE Timeline for this CVE

CVE page created: Wed Mar 25 22:03:00 2026
CVE page last modified: Fri May 8 12:08:49 2026