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CVE-2026-58250 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a	[email protected]	Patch
https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27	[email protected]	Patch
https://github.com/nats-io/nats-server/releases/tag/v2.11.17	[email protected]	Release Notes
https://github.com/nats-io/nats-server/releases/tag/v2.12.8	[email protected]	Release Notes
https://github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-476	NULL Pointer Dereference	[email protected]

Affected Products

Product	Versions
linuxfoundation nats-server	< 2.11.17 >= 2.12.0, < 2.12.8
CPE cpe:2.3:a:linuxfoundation:nats-server:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Jul 13, 2026	Initial Analysis	[email protected]
Jul 9, 2026	CVE Modified	CISA-ADP
Jul 8, 2026	New CVE Received	[email protected]