CVE-2026-58207Network attack vector

Remote crash via Connz pagination integer overflow

Published Jul 8, 2026 · Updated Jul 8, 2026

Integer overflow in NATS Server before 2.12.12 or 2.14.0-RC.1 through 2.14.2 allows remote authenticated users to crash the server. Connz computes the response slice endpoint by adding attacker-controlled Offset and Limit values before safely bounding the result, so signed overflow produces an invalid slice index and panic. Reachability requires permission to publish account-scoped connection-monitoring requests; no-auth deployments expose the path to any client with network access.

CVSS severity7.7
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in NATS Server before 2.12.12 or 2.14.0-RC.1 through 2.14.2 allows remote authenticated users to crash the server. Connz computes the response slice endpoint by adding attacker-controlled Offset and Limit values before safely bounding the result, so signed overflow produces an invalid slice index and panic. Reachability requires permission to publish account-scoped connection-monitoring requests; no-auth deployments expose the path to any client with network access.

The record

CVE
CVE-2026-58207
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
NATS
Product
NATS Server
Classifications
CWE-190, CAPEC-92, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.12.12
  2. Affected versionversion=>= 2.14.0-RC.1, < 2.14.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

NATS · NATS Serverversion=< 2.12.12; version=>= 2.14.0-RC.1, < 2.14.3

Published CVSS scores

7.7GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CAPEC-92Forced Integer Overflow
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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