Cloudanix VulnDB

CVE-2026-33248

Medium · 4.2

CVSS

4.2

EPSS

0.2%

Published

Mar 25, 2026

CISA due date

—

The record

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.

Affected packages

Ecosystem Package Introduced Fixed
Chainguard k3s 0 1.35.2.1-r4
Chainguard k3s-1.32 0 1.32.13.1-r7
Chainguard k3s-1.33 0 1.33.9.1-r6
Chainguard k3s-static 0 1.35.2.1-r4
Chainguard k3s-static-1.32 0 1.32.13.1-r7
Chainguard k3s-static-1.33 0 1.33.9.1-r6
Chainguard kine 0 0.14.15-r1
Chainguard milvus-2.5 0 2.5.27-r4
Chainguard nats 0 0.3.2-r0
Chainguard nats-fips 0 0.3.2-r0
Chainguard nats-top 0 0.6.3-r18
Chainguard nats-top-fips 0 0.6.3-r16
Chainguard prometheus-nats-exporter 0 0.19.1-r4
Chainguard prometheus-nats-exporter-fips 0 0.19.1-r4
Chainguard rke2-runtime-1.33 0 1.33.9.2.1-r3
Chainguard rke2-runtime-1.34 0 1.34.5.2.1-r3
Chainguard rke2-runtime-1.35 0 1.35.2.2.1-r3
Chainguard rke2-runtime-fips-1.34 0 1.34.6.2.1-r2
Chainguard rke2-runtime-fips-1.35 0 1.35.2.2.1-r2
Chainguard telegraf-1.37 0 1.37.3-r6
Chainguard telegraf-1.38 0 1.38.1-r1
Wolfi k3s 0 1.35.2.1-r4
Wolfi k3s-1.32 0 1.32.13.1-r7
Wolfi k3s-1.33 0 1.33.9.1-r6
Wolfi k3s-static 0 1.35.2.1-r4
Wolfi k3s-static-1.32 0 1.32.13.1-r7
Wolfi k3s-static-1.33 0 1.33.9.1-r6
Wolfi kine 0 0.14.15-r1
Wolfi nats 0 0.3.2-r0
Wolfi nats-top 0 0.6.3-r18
Wolfi prometheus-nats-exporter 0 0.19.1-r4
Wolfi telegraf-1.37 0 1.37.3-r6
Wolfi telegraf-1.38 0 1.38.1-r1
openSUSE:Leap 15.6 govulncheck-vulndb 0 0.0.20260326T203309-150000.1.155.2

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