CVE-2026-58208

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 56% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 4 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.5
EG Score
7.5(medium)
EPSS
44.2%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 9, 2026

Advisory Details (5)

Auto-updated Jul 8, 2026
Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

Release v2.14.3

Patch available: nats-io/nats-server v2.14.3

https://github.com/nats-io/nats-server/releases/tag/v2.14.3
github_release Patch Available

Release v2.12.12

Patch available: nats-io/nats-server v2.12.12

https://github.com/nats-io/nats-server/releases/tag/v2.12.12
github_commit

commit 837536b98b3a (nats-io/nats-server)

Fix landed in nats-io/nats-server commit 837536b98b3a — awaiting tagged release

https://github.com/nats-io/nats-server/commit/837536b98b3a9280b993282155ff2bdd3ca38c30
github_commit

commit 73b3dd9a5ea0 (nats-io/nats-server)

Fix landed in nats-io/nats-server commit 73b3dd9a5ea0 — awaiting tagged release

https://github.com/nats-io/nats-server/commit/73b3dd9a5ea0fa7bf08b702338676355b29b5fb4
github Patch Available

MQTT-over-WebSocket Path Can Crash WebSocket-Only JetStream Servers Before MQTT Is Enabled · Advisory · nats-io/nats-server · GitHub

Affected: v2.14.3 and v2.12.12.

https://github.com/nats-io/nats-server/security/advisories/GHSA-p957-7v2w-g93g

Vendor Advisories for CVE-2026-58208(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 12× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 18:57 UTCEG score recompute
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-11 07:28 UTCEG score recompute
  5. 2026-07-10 19:58 UTCEG score recompute
  6. 2026-07-10 08:28 UTCEG score recompute
  7. 2026-07-09 20:59 UTCEG score recompute▲ 0.70
  8. 2026-07-09 19:36 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  9. 2026-07-09 19:10 UTCEPSS rescore
  10. 2026-07-09 19:10 UTCEPSS rescore
  11. 2026-07-08 20:45 UTCEG score recompute
  12. 2026-07-08 20:44 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-58208?
CVE-2026-58208 is a high vulnerability published on July 8, 2026. 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…
When was CVE-2026-58208 disclosed?
CVE-2026-58208 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58208 actively exploited?
CVE-2026-58208 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 44.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58208?
CVE-2026-58208 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-58208?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58208, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-58208

Explore →

Is Your Infrastructure Affected by CVE-2026-58208?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs