AUGUST 24, 2026
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Case File

CVE-2026-58253

HIGH · CVSS 8.8 EPSS 0.23% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-08 · Last synced 2026-08-07

CyberRota Analysis

AI-Generated

NATS Server versions prior to 2.14.0, 2.12.7, and 2.11.16 are vulnerable to an authentication bypass that allows unauthenticated peers to exploit a parser fast path, potentially gaining unauthorized access to inter-server communication. This could lead to unauthorized operations with elevated privileges, posing significant security risks. Organizations using affected versions should prioritize upgrading to the patched releases to mitigate this vulnerability.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-58253
Severity
HIGH
CVSS
8.8
EPSS
0.23%

Original NVD Description

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.0, 2.12.7, and 2.11.16, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

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