CVE-2026-33222 NATS JetStream has an authorization bypass through its Management API
Users with limited JetStream restore permissions can bypass authorization to restore data into unauthorized streams, affecting NATS Server deployments.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33222?
CVE-2026-33222 is a medium-severity authentication bypass vulnerability in nats-io nats-server, published on 25 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
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.
Weakness: CWE-285
Which versions are affected by CVE-2026-33222?
9 open source packages ship an affected version, including github.com/nats-io/nats-server/v2, nats and github.com/nats-io/nats-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/nats-io/nats-server/v2 Go | All versions | 2.11.15, 2.12.6 |
github.com/nats-io/nats-server/v2 Go | All versions | 2.11.15 |
github.com/nats-io/nats-server/v2 Go | All versions | 2.11.15 |
github.com/nats-io/nats-server/v2 Go | From 2.12.0-RC.1 | 2.12.6 |
github.com/nats-io/nats-server/v2 Go | From 2.12.0-RC.1 | 2.12.6 |
nats Bitnami | All versions | 2.11.15, 2.12.6 |
3 more packages
github.com/nats-io/nats-server Go | All versions | None |
github.com/nats-io/nats-server Go | All versions | None |
github.com/nats-io/nats-server Go | All versions | None |
Products include Linuxfoundation Nats-Server.
How do I fix CVE-2026-33222?
Upgrade github.com/nats-io/nats-server/v2 to a fixed version for your release line: 2.11.15 or 2.12.6.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-33222 being exploited?
There is no known exploitation of CVE-2026-33222 in the wild and no public exploit code.
Other vulnerabilities in nats-io nats-server
- CVE-2022-28357 NATS nats-server allows directory traversal via unintended path to a management action
- CVE-2026-58253 NATS Server: Route API Auth Bypass
- CVE-2022-24450 Incorrect Authorization in NATS nats-server
- CVE-2026-33216 NATS has MQTT plaintext password disclosure
- CVE-2026-58207 NATS Server: Remote crash via integer overflow in Connz pagination
Sources
Also known as BIT-nats-2026-33222, CLEANSTART-2026-YB47349, DEBIAN-CVE-2026-33222, ECHO-1242-81fa-2b3a, GHSA-9983-vrx2-fg9c, GO-2026-4832 and 10 more.