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Fencer Vulns
high 7.7

CVE-2026-58207 json

NATS Server: Remote crash via integer overflow in Connz pagination

published 2026-07-08 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-42389

cvss
7.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 46%
public exploits
0
none known

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.

Patch / fix

  • linuxfoundation nats-server 2.12.12, 2.14.3
  • nats-server Debian 14 2.14.3-1

debian advisories DEBIAN-CVE-2026-58207

  • telegraf Azure Linux 3.0 1.31.0-27

azure linux advisories AZL-92241

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-58207 updated cvss 6.5

github.com/nats-io/nats-server: NATS Server: Denial of Service via arithmetic overflow in connection monitoring pagination

  • Red Hat Multicluster Global Hub multicluster-globalhub/multicluster-globalhub-grafana-rhel9 Red Hat Ceph Storage 5 rhceph/snmp-notifier-rhel8 Red Hat Ceph Storage 6 rhceph/snmp-notifier-rhel9 Red Hat Ceph Storage 7 rhceph/snmp-notifier-rhel9 Red Hat Ceph Storage 8 rhceph/snmp-notifier-rhel9 Red Hat Ceph Storage 9 rhceph/snmp-notifier-rhel10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images nats-server2.12, nats-server2.14 Red Hat OpenShift Container Platform 4 openshift4/oc-mirror-plugin-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • nats-io nats-server

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.