CVE-2026-58210

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7%, top 50% 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, secondary
Trending — 3 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, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the parser waited for the advertised MQTT packet length. This issue is fixed in versions 2.14.3 and 2.12.12.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
50.1%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 13, 2026

Advisory Details (5)

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

MQTT partial CONNECT packets can exhaust pre-auth memory · Advisory · nats-io/nats-server · GitHub

Affected: v2.14.3 and v2.12.12.

https://github.com/nats-io/nats-server/security/advisories/GHSA-r72h-j7qq-v6qg
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 e016e47bbf70 (nats-io/nats-server)

Fix landed in nats-io/nats-server commit e016e47bbf70 — awaiting tagged release

https://github.com/nats-io/nats-server/commit/e016e47bbf70304945f2ae9dc397e4862adefaf5
github_commit

commit bce9ef39469e (nats-io/nats-server)

Fix landed in nats-io/nats-server commit bce9ef39469e — awaiting tagged release

https://github.com/nats-io/nats-server/commit/bce9ef39469e610aeddb819194ceb7f7edfc0861

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 23× 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. 2026-07-14 19:13 UTCEG score recompute
  2. 2026-07-14 08:12 UTCEG score recompute
  3. 2026-07-13 22:31 UTCEPSS rescore
  4. 2026-07-13 21:12 UTCEG score recompute
  5. 2026-07-13 10:13 UTCEG score recompute
  6. 2026-07-13 06:13 UTCEPSS rescore
  7. 2026-07-13 06:13 UTCEPSS rescore
  8. 2026-07-12 23:15 UTCEG score recompute
  9. 2026-07-12 12:15 UTCEG score recompute
  10. 2026-07-12 05:46 UTCEPSS rescore
  11. 2026-07-12 01:16 UTCEG score recompute
  12. 2026-07-11 14:17 UTCEG score recompute
  13. 2026-07-11 08:27 UTCEPSS rescore
  14. 2026-07-11 08:27 UTCEPSS rescore
  15. 2026-07-11 03:13 UTCEG score recompute
  16. 2026-07-10 16:15 UTCEG score recompute
  17. 2026-07-10 05:13 UTCEG score recompute
  18. 2026-07-09 19:10 UTCEPSS rescore
  19. 2026-07-09 19:10 UTCEPSS rescore
  20. 2026-07-09 18:13 UTCEG score recompute
  21. 2026-07-09 07:14 UTCEG score recompute
  22. 2026-07-08 20:16 UTCEG score recompute
  23. 2026-07-08 20:14 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58210?
CVE-2026-58210 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, an unauthenticated MQTT client could cause the server to retain large incomplete MQTT CONNECT packets before authentication completed, consuming server memory while the…
When was CVE-2026-58210 disclosed?
CVE-2026-58210 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-2026-58210 actively exploited?
CVE-2026-58210 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 50.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58210?
CVE-2026-58210 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-58210?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58210, 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

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