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CVE-2026-33222

NATS JetStream has an authorization bypass through its Management API

MEDIUM

4.9

CVSS Score

Published: March 25, 2026 at 08:10 PM UTC

Updated: June 17, 2026 at 10:37 AM UTC

2 products affected across 2 vendorsNats ServerNats Server

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Severity

MEDIUM4.9

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nats Server · Linuxfoundation

95%

v < 2.11.152.12.0 ≤ v < 2.12.6

Nats Server · Nats Io

60%

v < 2.11.15v < 2.12.6

Affected range stops below 2.11.15, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.12.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMMitigationVendor Advisory

Source: cverecord

https://github.com/nats-io/nats-server/security/advisories/GHSA-9983-vrx2-fg9c

x_refsource_MISCMitigationVendor Advisory

Source: cverecord

https://advisories.nats.io/CVE/secnote-2026-12.txt

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.9MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: HIGH
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-285

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