CVE-2026-58254

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 65% 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
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: 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 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode operator to send trace events to subjects that would not otherwise be permitted and to use trace-only behavior to prevent normal delivery or storage of affected messages. This issue is fixed in versions 2.14.3 and 2.12.8.

CVSS v3
6.5
EG Score
6.5(medium)
EPSS
22.7%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 13, 2026

Advisory Details (4)

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

Incomplete fix for CVE-2026-33249: Leaf node connections bypass Nats-Trace-Dest permission check · Advisory · nats-io/nats-server · GitHub

Affected: v2.14.3 and v2.12.8.

https://github.com/nats-io/nats-server/security/advisories/GHSA-p3j5-5hrq-p75h
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 v2.12.8

Patch available: nats-io/nats-server v2.12.8

https://github.com/nats-io/nats-server/releases/tag/v2.12.8
github_commit

commit cbe845932980 (nats-io/nats-server)

Fix landed in nats-io/nats-server commit cbe845932980 — awaiting tagged release

https://github.com/nats-io/nats-server/commit/cbe845932980b71563efac5cfa4cc751c88936cd

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 18× 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. 2026-07-15 02:00 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-14 06:15 UTCEG score recompute▲ 1.20
  4. 2026-07-13 22:31 UTCEPSS rescore
  5. 2026-07-13 16:08 UTCNVD updateCVSS v3 → 6.5
  6. 2026-07-13 06:13 UTCEPSS rescore
  7. 2026-07-13 06:13 UTCEPSS rescore
  8. 2026-07-13 04:15 UTCEG score recompute
  9. 2026-07-12 05:46 UTCEPSS rescore
  10. 2026-07-12 02:15 UTCEG score recompute
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-11 08:27 UTCEPSS rescore
  13. 2026-07-11 00:16 UTCEG score recompute
  14. 2026-07-09 22:15 UTCEG score recompute
  15. 2026-07-09 19:10 UTCEPSS rescore
  16. 2026-07-09 19:10 UTCEPSS rescore
  17. 2026-07-08 20:16 UTCEG score recompute
  18. 2026-07-08 20:14 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58254?
CVE-2026-58254 is a medium 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 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode…
When was CVE-2026-58254 disclosed?
CVE-2026-58254 was first published in the National Vulnerability Database on July 8, 2026, with the most recent update on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58254 actively exploited?
CVE-2026-58254 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58254?
CVE-2026-58254 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-58254?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58254, 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-2026-58254

Explore →

Is Your Infrastructure Affected by CVE-2026-58254?

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

Start Free Scan →Browse All CVEs