CVE-2026-58250

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 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
50.2%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 13, 2026

Advisory Details (5)

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

Pre-auth server crash via double INFO in leafnode handshake — incomplete fix for CVE-2026-29785 and CVE-2026-33218 · Advisory · nats-io/nats-server · GitHub

Affected: v2.12.8 and v2.11.17.

https://github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67
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_release Patch Available

Release v2.11.17

Patch available: nats-io/nats-server v2.11.17

https://github.com/nats-io/nats-server/releases/tag/v2.11.17
github_commit

commit fc5fe3917753 (nats-io/nats-server)

Fix landed in nats-io/nats-server commit fc5fe3917753 — awaiting tagged release

https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27
github_commit

commit 8dcb26eaea78 (nats-io/nats-server)

Fix landed in nats-io/nats-server commit 8dcb26eaea78 — awaiting tagged release

https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a

Vendor Advisories for CVE-2026-58250(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 29× in last 7d / 31× 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 22:17 UTCEG score recompute
  2. 2026-07-15 22:17 UTCVendor advisory
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 16:57 UTCEPSS rescore
  5. 2026-07-15 10:57 UTCEG score recompute
  6. 2026-07-15 10:57 UTCVendor advisory
  7. 2026-07-15 02:00 UTCEPSS rescore
  8. 2026-07-15 02:00 UTCEPSS rescore
  9. 2026-07-14 23:35 UTCEG score recompute
  10. 2026-07-14 12:15 UTCEG score recompute
  11. 2026-07-14 00:56 UTCEG score recompute
  12. 2026-07-13 22:31 UTCEPSS rescore
  13. 2026-07-13 13:36 UTCEG score recompute
  14. 2026-07-13 06:13 UTCEPSS rescore
  15. 2026-07-13 06:13 UTCEPSS rescore
  16. 2026-07-13 02:16 UTCEG score recompute
  17. 2026-07-12 14:57 UTCEG score recompute
  18. 2026-07-12 05:46 UTCEPSS rescore
  19. 2026-07-12 03:36 UTCEG score recompute
  20. 2026-07-11 16:15 UTCEG score recompute
  21. 2026-07-11 08:27 UTCEPSS rescore
  22. 2026-07-11 08:27 UTCEPSS rescore
  23. 2026-07-11 04:55 UTCEG score recompute
  24. 2026-07-10 17:35 UTCEG score recompute
  25. 2026-07-10 06:15 UTCEG score recompute
Show 6 more
  1. 2026-07-09 19:10 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-09 18:55 UTCEG score recompute
  4. 2026-07-09 07:35 UTCEG score recompute
  5. 2026-07-08 20:16 UTCEG score recompute
  6. 2026-07-08 20:14 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-58250?
CVE-2026-58250 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 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by…
When was CVE-2026-58250 disclosed?
CVE-2026-58250 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-2026-58250 actively exploited?
CVE-2026-58250 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 50.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58250?
CVE-2026-58250 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-58250?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58250, 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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