VDB
DEBIAN-CVE-2026-33219
DEBIAN-CVE-2026-33219
PUBLISHED
CVSS 5.300000190734863 MEDIUM
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 malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data. This is a milder variant of CVE-2026-27571. That earlier issue was a compression bomb, this vulnerability is not. Attacks against this new issue thus require significant client bandwidth. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable websockets if not required for project deployment.
Risk Scores
CVSS v3.1
5.300000190734863
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Debian:13 | nats-server | 0, 2.10.27-1, 2.12.4-1 |
| Debian:12 | nats-server | 2.12.6-1, 2.9.10-1, 2.9.19-1 |
| Debian:14 | nats-server | 0, 2.10.27-1, 2.12.4-1 |
Timeline
- Mar 25, 2026 CVE Published
- Apr 28, 2026 CVE Updated