CVE-2026-58207

NATS Server: Remote crash via integer overflow in Connz pagination

7.7 HighFix available

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.

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: None
Integrity: None
Availability: High

Exploit likelihood

0.56%Unchanged since Jul 9, 2026

What each source reports

CVE List Score used 7.7

NATS Server: Remote crash via integer overflow in Connz pagination

Record: CVE-2026-58207
CVSS 3.1: 7.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Weakness: CWE-190
Updated: 2026-11-02

EUVDEUVD-2026-42389 7.7

Record: EUVD-2026-42389
CVSS 3.1: 7.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Updated: 2026-11-02

NVD 7.7

Record: CVE-2026-58207
CVSS 3.1: 7.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-190
Updated: 2026-11-02

OSV 7.7

NATS Server: Remote crash via integer overflow in Connz pagination

Record: CVE-2026-58207
CVSS 3.1: 7.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Weakness: CWE-190
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-58207 6.5

Record: DEBIAN-CVE-2026-58207
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-58207 7.7

Record: UBUNTU-CVE-2026-58207
CVSS 3.1: 7.7 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVAZL-92241 No score

CVE-2026-58207 affecting package telegraf for versions less than 1.31.0-27

Record: AZL-92241
Updated: 2026-11-05

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`telegraf` Azure Linux:3	before 1.31.0-27	1.31.0-27
`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 2.14.3-1, plus listed versions 2.10.27-12.12.4-12.12.6-12.14.1-1	2.14.3-1
`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:26.10	All versions, plus listed versions 2.10.27-1build12.14.1-12.14.3-1	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
Recorded	Changed	Sources
Nov 5, 2026	facts	OSV
Nov 2, 2026	first indexed	CVE List, EUVD, NVD, OSV

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

In short

CVE-2026-58207 is a high vulnerability (CVSS 7.7) 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 0.56%, the 46th percentile. Fixed in telegraf 1.31.0-27.

References

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