CVE-2026-33215
Fixed in a distro release EPSS <1%CVSS 6.5
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. The nats-server provides an MQTT client interface. Prior to versions 2.11.15 and 2.12.5, Sessions and Messages can by hijacked via MQTT Client ID malfeasance. Versions 2.11.15 and 2.12.5 patch the issue. No known workarounds are available.
Products: nats-io nats-server
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Go | github.com/nats-io/nats-server | no fix |
| Go | github.com/nats-io/nats-server/v2 | 2.11.15 |
| Go | github.com/nats-io/nats-server/v2 | 2.12.6 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | k3s | 1.35.2.1-r4 |
| Chainguard | k3s-1.32 | 1.32.13.1-r7 |
| Chainguard | k3s-1.33 | 1.33.9.1-r6 |
| Chainguard | k3s-static | 1.35.2.1-r4 |
| Chainguard | k3s-static-1.32 | 1.32.13.1-r7 |
| Chainguard | k3s-static-1.33 | 1.33.9.1-r6 |
| Chainguard | kine | 0.14.15-r1 |
| Chainguard | milvus-2.5 | 2.5.27-r4 |
| Chainguard | nats | 0.3.2-r0 |
| Chainguard | nats-fips | 0.3.2-r0 |
| Chainguard | nats-top | 0.6.3-r18 |
| Chainguard | nats-top-fips | 0.6.3-r16 |
| Chainguard | prometheus-nats-exporter | 0.19.1-r4 |
| Chainguard | prometheus-nats-exporter-fips | 0.19.1-r4 |
| Chainguard | rke2-runtime-1.31 | no fix |
| Chainguard | rke2-runtime-1.32 | no fix |
| Chainguard | rke2-runtime-1.33 | 1.33.9.2.1-r3 |
| Chainguard | rke2-runtime-1.34 | 1.34.5.2.1-r3 |
| Chainguard | rke2-runtime-1.35 | 1.35.2.2.1-r3 |
| Chainguard | rke2-runtime-fips-1.31 | no fix |
| Chainguard | rke2-runtime-fips-1.32 | no fix |
| Chainguard | rke2-runtime-fips-1.33 | 1.33.10.2.3-r2 |
| Chainguard | rke2-runtime-fips-1.34 | 1.34.6.2.1-r2 |
| Chainguard | rke2-runtime-fips-1.35 | 1.35.2.2.1-r2 |
| Chainguard | telegraf-1.35 | no fix |
| Chainguard | telegraf-1.36 | no fix |
| Chainguard | telegraf-1.37 | 1.37.3-r6 |
| Chainguard | telegraf-1.38 | 1.38.1-r1 |
| Debian 12 | nats-server | no fix |
| Debian 13 | nats-server | no fix |
| Debian 14 | nats-server | 2.12.6-1 |
| Ubuntu 24.04 LTS | nats-server | no fix |
| Ubuntu 25.10 | nats-server | no fix |
| Ubuntu 26.10 | nats-server | no fix |
| Ubuntu Pro 26.04 LTS | nats-server | no fix |
| Wolfi | k3s | 1.35.2.1-r4 |
| Wolfi | k3s-1.32 | 1.32.13.1-r7 |
| Wolfi | k3s-1.33 | 1.33.9.1-r6 |
| Wolfi | k3s-static | 1.35.2.1-r4 |
| Wolfi | k3s-static-1.32 | 1.32.13.1-r7 |
| Wolfi | k3s-static-1.33 | 1.33.9.1-r6 |
| Wolfi | kine | 0.14.15-r1 |
| Wolfi | nats | 0.3.2-r0 |
| Wolfi | nats-top | 0.6.3-r18 |
| Wolfi | telegraf-1.36 | no fix |
| Wolfi | telegraf-1.37 | 1.37.3-r6 |
| Wolfi | telegraf-1.38 | 1.38.1-r1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20260326T203309-150000.1.155.2 |
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 |