CVE-2026-58207

HIGH 7.7

NATS Server: Remote crash via integer overflow in Connz pagination

CVSS Score

7.7

EPSS Score

0.5%

EPSS Percentile

42th

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.

CWE	CWE-190
Vendor	nats-io
Product	nats-server
Published	Jul 8, 2026
Last Updated	Jul 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

nats-io / nats-server

< 2.12.12 >= 2.14.0-RC.1, < 2.14.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/nats-io/nats-server/security/advisories/GHSA-q59r-vq66-pxc2 github.com: https://github.com/nats-io/nats-server/commit/2ae047139e37a38cb01e259a67909e7a39fa38e9 github.com: https://github.com/nats-io/nats-server/commit/894d9411927681d66ce349bf1afe49608dc0c1a3 github.com: https://github.com/nats-io/nats-server/releases/tag/v2.12.12 github.com: https://github.com/nats-io/nats-server/releases/tag/v2.14.3