BIT-nats-2026-33219

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Import Source
https://github.com/bitnami/vulndb/tree/main/data/nats/BIT-nats-2026-33219.json
JSON Data
https://api.osv.dev/v1/vulns/BIT-nats-2026-33219
Aliases
Published
2026-03-27T17:45:18.190Z
Modified
2026-03-27T18:26:09.072082Z
Summary
NATS is vulnerable to pre-auth DoS through WebSockets client service
Details

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.

Database specific 
{
    "cpes": [
        "cpe:2.3:a:nats:nats_server:*:*:*:*:*:go:*:*"
    ],
    "severity": "Medium"
}
References

Affected packages

Bitnami / nats

Package

Name
nats
Purl
pkg:bitnami/nats

Severity

  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.11.15
Introduced
2.12.0
Fixed
2.12.6

Database specific

source 
"https://github.com/bitnami/vulndb/tree/main/data/nats/BIT-nats-2026-33219.json"