7.5

CVE-2026-58208: linuxfoundation nats-server Uncaught Exception

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-58208DEBIAN-CVE-2026-58208
Published 08-07-2026Last modified 09-07-2026
Open JSON

Vulnerability summary

CVE-2026-58208 is a high (CVSS 7.5) Uncaught Exception vulnerability in linuxfoundation nats-server. EPSS estimates a 0.60% chance of exploitation in the next 30 days, higher than 47.7% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.60%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-07-2026
    PublishedVulnerability first disclosed.
  2. 09-07-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.60%

Chance of exploitation in the next 30 days

Percentile

48%

Versus all other CVEs

30-day change

0.00 pp

From 0.60% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.60%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • nats-serverAll versions (No fix recorded) | < 2.14.3-1
Linuxfoundation1 product
  • nats-server≥ 2.12.0, < 2.12.12 | ≥ 2.14.0, < 2.14.3
Nats-io1 product
Ubuntu1 product
  • nats-serverAll versions (No fix recorded)

4 vendors · 4 products

References

9 links