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CVE-2026-58209

NATS Server: MQTT retained and QoS replay bypass subscribe deny filters

Published: Jul 8, 2026Updated: Jul 13, 2026 Sources: CVE List NVDCWE-863
4.3MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 83.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-863

Affected Products

nats-io
oss-project
nats-serverOn-prem
Databases / cache-message-queue
linuxfoundation
oss-project·USaka everest, pytorch, yocto
nats-serverOn-premDatabase
AI / ML / vector-db-rag

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
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References

https://github.com/nats-io/nats-server/security/advisories/GHSA-7qmq-8cc4-hxwg
github.com
https://github.com/nats-io/nats-server/commit/181b1f51f40b9954c57e9d478e051fb257679356
github.com
https://github.com/nats-io/nats-server/commit/1c429b6fdc5afd4188cc5faf1127f6334896cd87
github.com
and 2 more references View all →

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