CVE-20XX-?
agent?

CVE-2026-58253

8.8 HIGH 0.4% exploit odds Fix listed Auth & access Browser & mail

What it is

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.

At a glance

Exploitability
Can be exploited from the same network segment without logging in. High risk of data tampering.
Exploit odds
0.4% chance of exploitation in the next 30 days (EPSS).
Fix
A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

  1. PublishedDisclosed publicly on CVE.org and NVD
  2. Last updatedMost recent change to the record

Why it ranks here

Details

Published
Last modified
Exploit probability
0.4% · EPSS, next 30 days
Weakness
CWE-287 · Improper authentication
Record status
Analyzed

Affected

Attack profile CVSS 3.1 · 8.8

Attack vector
Adjacent network
Complexity
Low
Privileges needed
None
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
Low
Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-58253.md and follow it. Check whether this project is affected by CVE-2026-58253. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record