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Vulnerability · Published Mar 25, 2026 · Assigned by GitHub_M

CVE-2026-33222NATS JetStream has an authorization bypass through its Management API

Medium 4.9

In plain English

A medium-severity security flaw in nats-server from nats-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.9Medium
Exploit odds (30 days)0.3%top 75.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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, users with JetStream admin API access to restore one stream could restore to other stream names, impacting data which should have been protected against them. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, if developers have configured users to have limited JetStream restore permissions, temporarily remove those permissions.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23nats-server2.12.6-r0ALPINE-CVE-2026-33222
Alpine:v3.24nats-server2.12.6-r0ALPINE-CVE-2026-33222
Debian:12nats-serverno fix listedDEBIAN-CVE-2026-33222
Debian:13nats-serverno fix listedDEBIAN-CVE-2026-33222
Debian:14nats-server2.12.6-1DEBIAN-CVE-2026-33222
Gogithub.com/nats-io/nats-serverno fix listedGO-2026-4832
Gogithub.com/nats-io/nats-serverno fix listedGHSA-9983-vrx2-fg9c
Gogithub.com/nats-io/nats-server/v22.12.6GHSA-9983-vrx2-fg9c
Gogithub.com/nats-io/nats-server/v22.11.15GHSA-9983-vrx2-fg9c
Gogithub.com/nats-io/nats-server/v22.11.15, 2.12.6GO-2026-4832
Ubuntu:24.04:LTSnats-serverno fix listedUBUNTU-CVE-2026-33222
Ubuntu:25.10nats-serverno fix listedUBUNTU-CVE-2026-33222
Ubuntu:26.10nats-serverno fix listedUBUNTU-CVE-2026-33222

Affected products (as reported)

VendorProductVersions
nats-io nats-server < 2.11.15>= 2.12.0-RC.1, < 2.12.6

Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

References