VDB
DEBIAN-CVE-2026-27889
DEBIAN-CVE-2026-27889
PUBLISHED
CVSS 7.5 HIGH
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.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:14 | nats-server | 2.12.4-1, 2.10.27-1, 0 |
| Debian:12 | nats-server | 2.9.10-1, 2.9.19-1, 2.10.4-1 |
| Debian:13 | nats-server | 2.12.4-1, 2.12.6-1, 2.10.27-1 |
Exploit Intelligence
- probe_messaging.go (github-poc)
Timeline
- Mar 25, 2026 CVE Published
- Apr 28, 2026 CVE Updated