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

Exploitation and risk

Source status

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Risk history

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Advisory history

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15 Nov 2026 09:38:18 UTC