Is CVE-2026-58208 in the CISA KEV catalog?

No. CVE-2026-58208 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-58208?

CVE-2026-58208 has a CVSS v3 base score of 6.8 (Moderate).

What is the EPSS score for CVE-2026-58208?

CVE-2026-58208 has an EPSS score of 0.59% (44th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-58208?

Upgrade nats-server on debian unstable to 2.14.3-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-58208

MEDIUM

6.8

CVSS v3

NVD

Description

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.3 and 2.12.12, a WebSocket listener could route requests for the MQTT-over-WebSocket path into MQTT handling even when MQTT was not configured, allowing an unauthenticated client with access to the WebSocket listener to reach uninitialized MQTT state and crash the server process. This issue is fixed in versions 2.14.3 and 2.12.12.

CWE-248

How to fix

Remediation Available

nats-serverDebian

Fixed in:2.14.3-1CVE-2026-58208

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.59%probability of exploitation in 30 days

44thpercentile

Moderate risk: more likely to be exploited than 44% of all known CVEs.

References

Patch2

Vendor Advisory1

github.com

Release Notes2

Related Vulnerabilities

Other CWE-248 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-37714	High	7.5	6.9%	-	Fix
CVE-2025-53366	Unscored	-	5.7%	-	-
CVE-2018-11466	Critical	9.8	4.0%	-	-
CVE-2025-59465	High	7.5	3.8%	-	Fix
CVE-2018-7852	High	7.5	3.6%	-	-
CVE-2020-6019	High	7.5	2.8%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-09.