CVE-2026-58207

NATS Server: Remote crash via integer overflow in Connz pagination

CVE-2026-58207 is fixed in nats-server on 1 platform by DEBIAN-CVE-2026-58207 (version 2.14.3-1), released July 6, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.7

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0056

46th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
nats-server · Debian 14	2.14.3-1	DEBIAN-CVE-2026-58207	Jul 6, 2026

Details

Published
July 8, 2026
Weakness
Integer Overflow or Wraparound
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58207

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