Medium severity6.5NVD Advisory· Published Mar 24, 2026· Updated Jun 17, 2026
CVE-2026-33215
CVE-2026-33215
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/nats-io/nats-server/v2Go | < 2.11.15 | 2.11.15 |
github.com/nats-io/nats-server/v2Go | >= 2.12.0-RC.1, < 2.12.6 | 2.12.6 |
Affected products
40- cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*Range: >=2.0.0,<2.11.15
- osv-coords38 versionspkg:apk/chainguard/k3spkg:apk/chainguard/k3s-1.32pkg:apk/chainguard/k3s-1.33pkg:apk/chainguard/k3s-staticpkg:apk/chainguard/k3s-static-1.32pkg:apk/chainguard/k3s-static-1.33pkg:apk/chainguard/kinepkg:apk/chainguard/milvus-2.5pkg:apk/chainguard/natspkg:apk/chainguard/nats-fipspkg:apk/chainguard/nats-toppkg:apk/chainguard/nats-top-fipspkg:apk/chainguard/prometheus-nats-exporterpkg:apk/chainguard/prometheus-nats-exporter-fipspkg:apk/chainguard/rke2-runtime-1.33pkg:apk/chainguard/rke2-runtime-1.34pkg:apk/chainguard/rke2-runtime-1.35pkg:apk/chainguard/rke2-runtime-fips-1.33pkg:apk/chainguard/rke2-runtime-fips-1.34pkg:apk/chainguard/rke2-runtime-fips-1.35pkg:apk/chainguard/telegraf-1.37pkg:apk/chainguard/telegraf-1.38pkg:apk/wolfi/k3spkg:apk/wolfi/k3s-1.32pkg:apk/wolfi/k3s-1.33pkg:apk/wolfi/k3s-staticpkg:apk/wolfi/k3s-static-1.32pkg:apk/wolfi/k3s-static-1.33pkg:apk/wolfi/kinepkg:apk/wolfi/natspkg:apk/wolfi/nats-toppkg:apk/wolfi/prometheus-nats-exporterpkg:apk/wolfi/telegraf-1.37pkg:apk/wolfi/telegraf-1.38pkg:bitnami/natspkg:golang/github.com/nats-io/nats-server/v2pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2016.0
< 1.35.2.1-r4+ 37 more
- (no CPE)range: < 1.35.2.1-r4
- (no CPE)range: < 1.32.13.1-r7
- (no CPE)range: < 1.33.9.1-r6
- (no CPE)range: < 1.35.2.1-r4
- (no CPE)range: < 1.32.13.1-r7
- (no CPE)range: < 1.33.9.1-r6
- (no CPE)range: < 0.14.15-r1
- (no CPE)range: < 2.5.27-r4
- (no CPE)range: < 0.3.2-r0
- (no CPE)range: < 0.3.2-r0
- (no CPE)range: < 0.6.3-r18
- (no CPE)range: < 0.6.3-r16
- (no CPE)range: < 0.19.1-r4
- (no CPE)range: < 0.19.1-r4
- (no CPE)range: < 1.33.9.2.1-r3
- (no CPE)range: < 1.34.5.2.1-r3
- (no CPE)range: < 1.35.2.2.1-r3
- (no CPE)range: < 1.33.10.2.3-r2
- (no CPE)range: < 1.34.6.2.1-r2
- (no CPE)range: < 1.35.2.2.1-r2
- (no CPE)range: < 1.37.3-r6
- (no CPE)range: < 1.38.1-r1
- (no CPE)range: < 1.35.2.1-r4
- (no CPE)range: < 1.32.13.1-r7
- (no CPE)range: < 1.33.9.1-r6
- (no CPE)range: < 1.35.2.1-r4
- (no CPE)range: < 1.32.13.1-r7
- (no CPE)range: < 1.33.9.1-r6
- (no CPE)range: < 0.14.15-r1
- (no CPE)range: < 0.3.2-r0
- (no CPE)range: < 0.6.3-r18
- (no CPE)range: < 0.19.1-r4
- (no CPE)range: < 1.37.3-r6
- (no CPE)range: < 1.38.1-r1
- (no CPE)range: < 2.11.15
- (no CPE)range: < 2.11.15
- (no CPE)range: < 0.0.20260326T203309-150000.1.155.2
- (no CPE)range: < 0.0.20260723T184607-160000.1.1
- Range: < 2.11.15
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-fcjp-h8cc-6879ghsaADVISORY
- github.com/nats-io/nats-server/security/advisories/GHSA-fcjp-h8cc-6879nvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-33215ghsaADVISORY
- advisories.nats.io/CVE/secnote-2026-06.txnvdBroken LinkWEB
- pkg.go.dev/vuln/GO-2026-4833ghsaWEB
News mentions
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