CVE-2026-58207 Vulnerability Analysis & Exploit Details

CVE-2026-58207
Vulnerability Scoring

7.7

/10

Very High Risk

Highly exploitable, CVE-2026-58207 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: Low
Some privileges are necessary to exploit the vulnerability.
Scope: Changed
Successful exploitation can impact components beyond the vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2026-58207 Details

Status: Analyzed

Last updated: 🕖 09 Jul 2026, 19:13 UTC
Originally published on: 🕘 08 Jul 2026, 21:16 UTC

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CVE-2026-58207 Vulnerability Summary

CVE-2026-58207: 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.

Assessing the Risk of CVE-2026-58207

Access Complexity Graph

The exploitability of CVE-2026-58207 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-58207

CVE-2026-58207 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-58207, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-58207, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: None
CVE-2026-58207 has no significant impact on data confidentiality.
Integrity: None
CVE-2026-58207 poses no threat to data integrity.
Availability: High
CVE-2026-58207 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-58207 References

External References

CWE Common Weakness Enumeration

CWE-190

CAPEC Common Attack Pattern Enumeration and Classification

Forced Integer Overflow CAPEC-92 This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.

Vulnerable Configurations

cpe:2.3:a:linuxfoundation:nats-server:2.12.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc6:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:rc6:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:preview1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:preview1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:preview2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.0:preview2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.1:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.2:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.3:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc4:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc5:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc6:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.4:rc6:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.5:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.5:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.5:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.5:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.5:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.5:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.6:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.6:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.7:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.7:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.8:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.8:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.9:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.9:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.9:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.9:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.9:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.9:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.10:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.10:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.10:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.10:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.11:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.12.11:*:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.0:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.0:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.0:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.0:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.0:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.0:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.0:rc3:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.1:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.1:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.1:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.1:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.1:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.1:rc2:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.2:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.2:-:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.2:rc1:*:*:*:*:*:*
cpe:2.3:a:linuxfoundation:nats-server:2.14.2:rc1:*:*:*:*:*:*

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