CVE-2026-58250

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

CVE-2026-58250 is fixed in nats-server on 1 platform by DEBIAN-CVE-2026-58250 (version 2.14.1-1), released July 4, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0074

54th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
nats-server · Debian 14	2.14.1-1	DEBIAN-CVE-2026-58250	Jul 4, 2026

Details

Published
July 8, 2026
Weakness
NULL Pointer Dereference
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58250

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