BIT-nats-2026-33248

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Import Source
https://github.com/bitnami/vulndb/tree/main/data/nats/BIT-nats-2026-33248.json
JSON Data
https://api.osv.dev/v1/vulns/BIT-nats-2026-33248
Aliases
Published
2026-03-27T17:45:26.680Z
Modified
2026-03-27T18:26:05.115118Z
Summary
NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching
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.

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

  • 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

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-2026-33248.json"