CVE-2026-33248

MEDIUM

4.2

Description

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.

Details CVE

Score CVSS v3.14.2

SeveriteMEDIUM

Vecteur CVSSCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Vecteur d'attaqueNETWORK

ComplexiteHIGH

Privileges requisLOW

Interaction utilisateurNONE

Publie3/25/2026

Derniere modification3/26/2026

Sourcenvd

Observations honeypot0

Produits affectes

linuxfoundation:nats-server

Faiblesses (CWE)

CWE-287CWE-295

References

https://advisories.nats.io/CVE/secnote-2026-13.txt(security-advisories@github.com)

https://github.com/nats-io/nats-server/security/advisories/GHSA-3f24-pcvm-5jqc(security-advisories@github.com)

Correlations IOC

Aucune correlation enregistree

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