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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-58250

33
FAUCET Score

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.

First published: Jul 8, 2026Last modified: Jul 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 2.11.17CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*
>= 2.12.0, < 2.12.8CPE matchmatch criteria
cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.51%
Probability of exploitation in next 30 days
EPSS Percentile
40.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0050 is in the 18th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

microsoftpatch availablevia msrc
Product: azl3 telegraf 1.31.0-23 on Azure Linux 3.0Fixed in: 1.31.0-24
microsoftpatch availablevia msrc
Product: 21481-17084Fixed in: 1.31.0-24

Vendor Advisories (1)

microsoft2026-Jul/CVE-2026-58250Moderate

NATS Server: Pre-auth server crash via double INFO in leafnode handshake

Jul 2, 2026

References

github.com / nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a
Patch
github.com / nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27
Patch
github.com / nats-io/nats-server/releases/tag/v2.11.17
Release Notes
github.com / nats-io/nats-server/releases/tag/v2.12.8
Release Notes
github.com / nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67
Vendor Advisory