DEBIAN-CVE-2026-33219

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Source
https://security-tracker.debian.org/tracker/CVE-2026-33219
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33219.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-33219
Upstream
  • CVE-2026-33219
Published
2026-03-25T20:16:32.777Z
Modified
2026-03-29T04:01:30.298138Z
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
Summary
[none]
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.

References

Affected packages

Debian:12 / nats-server

Package

Name
nats-server
Purl
pkg:deb/debian/nats-server?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.9.10-1
2.9.19-1
2.10.1-1
2.10.3-1
2.10.4-1
2.10.7-1
2.10.16-1
2.10.18-1
2.10.24-1
2.10.27-1
2.12.4-1
2.12.6-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33219.json"

Debian:13 / nats-server

Package

Name
nats-server
Purl
pkg:deb/debian/nats-server?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.10.27-1
2.12.4-1
2.12.6-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33219.json"

Debian:14 / nats-server

Package

Name
nats-server
Purl
pkg:deb/debian/nats-server?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.12.6-1

Affected versions

2.*
2.10.27-1
2.12.4-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33219.json"