CVE-2026-33222

NATS JetStream has an authorization bypass through its Management API

CVSS 3.1 4.9 MEDIUMEUVD CVSS 3.1 4.9 CVSS 3.1 · [email protected] · Secondary 4.9 MEDIUMCVSS_V3 Publisher rating MODERATEFixed by github.com/nats-io/nats-server/v2 2.11.15 Fixed by github.com/nats-io/nats-server/v2 2.12.6osv · severity unknownFixed by github.com/nats-io/nats-server/v2 2.11.15 Fixed by github.com/nats-io/nats-server/v2 2.12.6KEV status unknown

Original advisory

cve-program · CVE-2026-33222

Published

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.

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euvd · EUVD-2026-15994

Published

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nvd · CVE-2026-33222

Published

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osv · GHSA-9983-vrx2-fg9c

Published

### Background NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing. The persistent storage feature, JetStream, has a management API which has many features, amongst which are backup and restore. ### Problem Description 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. ### Affected Versions Any version before v2.12.6 or v2.11.15 ### Workarounds If developers have configured users to have limited JetStream restore permissions, temporarily remove those permissions.

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osv · GO-2026-4832

Published

NATS JetStream has an authorization bypass through its Management API in github.com/nats-io/nats-server

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Affected versions, risk and source history

cve-program · CVE-2026-33222

Published

nats-server

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "nats-io",
                    "product": "nats-server",
                    "versions": [
                        {
                            "version": "< 2.11.15",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.12.0-RC.1, < 2.12.6",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-15994

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Mar 25, 2026, 8:10:51 PM

dateUpdated: Mar 26, 2026, 3:26:11 PM

1 related source bulletins · separate from aliases

WID-SEC-W-2026-0858: NATS Server: Mehrere Schwachstellen

CVE-2026-33215 · CVE-2026-33216 · CVE-2026-33217 · CVE-2026-33218 · CVE-2026-33219 · CVE-2026-33222 · CVE-2026-33223 · CVE-2026-33246 · CVE-2026-33247 · CVE-2026-33248 · CVE-2026-33249

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-33222

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-285

Original publisher date fields

published: 2026-03-25T21:16:47.237

lastModified: 2026-06-17T10:37:09.010

1 source CPE criteria · context only

cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

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osv · GHSA-9983-vrx2-fg9c

Published

github.com/nats-io/nats-server/v2

SEMVER · introduced 0 → fixed 2.11.15

github.com/nats-io/nats-server/v2

SEMVER · introduced 2.12.0-RC.1 → fixed 2.12.6

github.com/nats-io/nats-server

SEMVER · introduced 0

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GO-2026-4832

Published

github.com/nats-io/nats-server

SEMVER · introduced 0

github.com/nats-io/nats-server/v2

SEMVER · introduced 0 → fixed 2.11.15 → introduced 2.12.0-RC.1 → fixed 2.12.6

Original source record · Cite this exact observation · Complete original publisher JSON