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Vulnerability · Published Jul 8, 2026 · Assigned by GitHub_M

CVE-2026-58207NATS Server: Remote crash via integer overflow in Connz pagination

High 7.7

In plain English

A high-severity integer overflow in nats-server from nats-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.6%top 53.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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, 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12nats-serverno fix listedDEBIAN-CVE-2026-58207
Debian:13nats-serverno fix listedDEBIAN-CVE-2026-58207
Debian:14nats-server2.14.3-1DEBIAN-CVE-2026-58207
Ubuntu:24.04:LTSnats-serverno fix listedUBUNTU-CVE-2026-58207
Ubuntu:25.10nats-serverno fix listedUBUNTU-CVE-2026-58207
Ubuntu:26.10nats-serverno fix listedUBUNTU-CVE-2026-58207

Affected products (as reported)

VendorProductVersions
nats-io nats-server < 2.12.12>= 2.14.0-RC.1, < 2.14.3

Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

References