TI-2026-41917 Aliases CVE-2026-58207

NATS Server: Remote crash via integer overflow in Connz pagination

LOW 34CWE-190Published 2026-07-08 · Updated 2026-07-09

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 6 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

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, a client able to send account-scoped connection monitoring requests could crash the server by supplying Connz pagination Offset and Limit values that overflowed internal arithmetic before the response window was safely bounded. This issue is fixed in versions 2.14.3 and 2.12.12.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0056 46th percentileScored 2026-11-07

Fix Partial nats-server (nats-io): 2.12.12, 2.14.3Red Hat: 6 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
backstage	nats-server	before 2.12.12; 2.14.0-RC.1 to before 2.14.3	2.12.12, 2.14.3	Patch available	CNA

nats-server Vendorbackstage Affected before 2.12.12; 2.14.0-RC.1 to before 2.14.3 Fixed in 2.12.12, 2.14.3 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:linuxfoundation:nats-server::::::::	2.12.0 to before 2.12.12; 2.14.0 to before 2.14.3	Vulnerable	backstage

cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* Versions 2.12.0 to before 2.12.12; 2.14.0 to before 2.14.3 Vulnerable ·backstage

Remediation

Fix · CNA nats-server (nats-io) Fixed in 2.12.12, 2.14.3

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Multicluster Global Hub	Affected	No fix yet: Fix deferred
Red Hat Ceph Storage 5	Affected	No fix yet: Fix deferred
Red Hat Ceph Storage 6	Affected	No fix yet: Fix deferred
Red Hat Ceph Storage 7	Affected	No fix yet: Fix deferred
Red Hat Ceph Storage 8	Affected	No fix yet: Fix deferred
Red Hat Ceph Storage 9	Affected	No fix yet: Fix deferred

Not affected: 2 products

Red Hat Hardened Images
Red Hat OpenShift Container Platform 4

Timeline

2026-10-02 Threatist record created from CVE-2026-58207

References

Patch 2

Advisory 1

https://github.com/nats-io/nats-server/security/advisories/GHSA-q59r-vq66-pxc2

Other 2

TI-2026-22233 NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead CVSS 3.1HIGH 7.5
TI-2022-11116 NATS nats-server 2.2.0 through 2.7.4 allows directory traversal because of an unintended… CVSS 3.1CRITICAL 9.8
TI-2020-16319 The JWT library in NATS nats-server before 2.1.9 has Incorrect Access Control because of… CVSS 3.1CRITICAL 9.8
TI-2026-25637 NATS has MQTT plaintext password disclosure CVSS 3.1HIGH 8.6
TI-2022-08320 NATS nats-server before 2.7.2 has Incorrect Access Control. CVSS 3.1HIGH 8.8
TI-2026-41950 NATS Server: Pre-auth server crash via double INFO in leafnode handshake CVSS 3.1HIGH 7.5

See all 35 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences