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CVE-2026-58213

NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection

7.1 HighFix available

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
Low
Availability
None

Exploit likelihood

0.44%Unchanged since Jul 9, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.1

NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Record
CVE-2026-58213
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-74
Updated
2026-11-02
EUVDEUVD-2026-42383 7.1

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Record
EUVD-2026-42383
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
NVD 7.1

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Record
CVE-2026-58213
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-74
Updated
2026-11-02
OSV 7.1

NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Record
CVE-2026-58213
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Weakness
CWE-74
Updated
2026-11-02
OSVDEBIAN-CVE-2026-58213 7.1

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Record
DEBIAN-CVE-2026-58213
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
OSVJLSEC-2026-1148 7.1

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Record
JLSEC-2026-1148
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVRHSA-2026:36016 7.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:36016
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:36017 7.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:36017
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-58213 7.1

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Record
UBUNTU-CVE-2026-58213
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Updated
2026-11-02
OSVBIT-nats-2026-58213 No score

NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Record
BIT-nats-2026-58213
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
nats
Bitnami
 before 2.12.9, 2.14.0 up to 2.14.1
2.12.92.14.1
nats-server
Debian:12
 All versions, plus listed versions
2.10.1-12.10.16-12.10.18-12.10.24-12.10.27-1
Show 11 moreShow less
2.10.3-12.10.4-12.10.7-12.12.4-12.12.6-12.14.1-12.14.3-12.14.6-12.15.1-12.9.10-12.9.19-1
 None known
nats-server
Debian:13
 All versions, plus listed versions
2.10.27-12.12.4-12.12.6-12.14.1-12.14.3-12.14.6-12.15.1-1
 None known
nats-server
Debian:14
 before 2.14.1-1, plus listed versions
2.10.27-12.12.4-12.12.6-1
2.14.1-1
nats_server_jll
Julia
 before 2.14.3+0
2.14.3+0
nats-server2.14
Red Hat:hummingbird:1
From an advisory covering 6 CVEs
 before 0:2.14.3-1.hum1
0:2.14.3-1.hum1
nats-server2.12
Red Hat:hummingbird:1
From an advisory covering 6 CVEs
 before 0:2.12.12-1.hum1
0:2.12.12-1.hum1
nats-server
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.9.19-1build12.10.3-12.10.4-12.10.7-12.10.7-1ubuntu0.12.10.7-1ubuntu0.22.10.7-1ubuntu0.3
 None known
nats-server
Ubuntu:25.10
 All versions, plus listed versions
2.10.24-12.10.27-1
 None known
nats-server
Ubuntu:Pro:26.04:LTS
 All versions, plus listed versions
2.10.27-12.10.27-1build12.10.27-1ubuntu0.26.04.1~esm1
 None known

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-58213 is a high vulnerability (CVSS 7.1) in Linuxfoundation Nats-server, published July 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.44%, the 38th percentile. Fixed in nats 2.12.9.

References

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