CVE•Published 2026-07-08•Modified 2026-07-13•1 article on news•5 live references•NVD data

CVE-2026-58253Linuxfoundation · Nats-server

Vulnerability data via NVD (ingested)

CVSS v3.1

8.8

HIGH

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

EPSS percentile

Exploit Prediction Scoring System · top 69% of all CVEs

Weaknesses (CWE)

CWE-287Improper Authentication

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.

Timeline

Published 2026-07-08

Modified 2026-07-13

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-58253

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Linuxfoundation Nats-server"

All exposed Linuxfoundation Nats-server instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Nats-server"

HTTP body or banner mentions "Nats-server" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-58253