Dashboard / CVE-2026-58253

CVE-2026-58253

HIGH
MEDIUM Priority: 0.03 BB Relevance: 63/100
Published: 2026-07-08 Modified: 2026-10-25 First seen: 2026-10-29 Status: active

Attack Surface

Adjacent Low Complexity No Auth No Interaction Integ. Impact Scope Change

CVSS Vector Breakdown

AV: Adjacent
AC: Low
PR: None
UI: None
S: Changed
C: Low
I: High
A: Low

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
linuxfoundation nats-server < 2.11.16
linuxfoundation nats-server 2.12.0 – 2.12.7

References & Advisories (7)

Bug Bounty Relevance

63 / 100
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

8.8 / 10.0 v3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L

EPSS — Exploitation Probability

0.37%
Raw Score 0.003680
Percentile 30.7%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00368
2026-10-28
0.00368

Intelligence Sources

nvd ref →

External Links