DEBIAN-CVE-2026-33248

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Source
https://security-tracker.debian.org/tracker/CVE-2026-33248
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33248.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-33248
Upstream
  • CVE-2026-33248
Published
2026-03-25T21:16:47.563Z
Modified
2026-03-26T12:00:52.687716Z
Severity
  • 4.2 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N 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, when using mTLS for client identity, with verify_and_map to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be correctly enforced, allowing for authentication bypass. This does require a valid certificate from a CA already trusted for client certificates, and DN naming patterns which the NATS maintainers consider highly unlikely. So this is an unlikely attack. Nonetheless, administrators who have been very sophisticated in their DN construction patterns might conceivably be impacted. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, developers should review their CA issuing practices.

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

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33248.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

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33248.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

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-2026-33248.json"