Cloudanix VulnDB

CVE-2026-27889

High · 7.5

CVSS

7.5

EPSS

0.9%

Published

Mar 25, 2026

CISA due date

—

The record

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.

Affected packages

Ecosystem Package Introduced Fixed
Chainguard k3s-1.32 0 1.32.13.1-r5
Chainguard k3s-static-1.32 0 1.32.13.1-r5
Chainguard milvus-2.5 0 2.5.27-r4
Chainguard rke2-runtime-fips-1.34 0 1.34.6.2.1-r1
Wolfi k3s-1.32 0 1.32.13.1-r5
Wolfi k3s-static-1.32 0 1.32.13.1-r5
openSUSE:Leap 15.6 govulncheck-vulndb 0 0.0.20260326T203309-150000.1.155.2

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