UBUNTU-CVE-2026-33246

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Source

https://ubuntu.com/security/CVE-2026-33246

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33246.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33246

Upstream

CVE-2026-33246

Published

2026-03-27T00:00:00Z

Modified

2026-03-27T17:20:15.175848Z

Severity

6.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server offers a Nats-Request-Info: message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker. A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked. Prior to versions 2.11.15 and 2.12.6, NATS clients relying upon the Nats-Request-Info: header could be spoofed. This does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds are available.

References

Affected packages

Ubuntu:24.04:LTS / nats-server

Package

Name: nats-server
Purl: pkg:deb/ubuntu/nats-server@2.10.7-1ubuntu0.3?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.9.19-1build1

2.10.3-1

2.10.4-1

2.10.7-1

2.10.7-1ubuntu0.1

2.10.7-1ubuntu0.2

2.10.7-1ubuntu0.3

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "golang-github-nats-io-nats-server-dev",
            "binary_version": "2.10.7-1ubuntu0.3"
        },
        {
            "binary_name": "nats-server",
            "binary_version": "2.10.7-1ubuntu0.3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33246.json"

Ubuntu:25.10 / nats-server