CVE-2026-58253

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 71% 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
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: 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 2.14.0, 2.12.7, and 2.11.16, when no_auth_user was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an unauthenticated peer to bypass inter-server CONNECT authentication and operate with the privileges associated with that connection type. This issue is fixed in versions 2.14.0, 2.12.7, and 2.11.16.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
29.0%
KEV
Not listed

Published

July 8, 2026

Last Modified

July 13, 2026

Advisory Details (7)

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

Route API Auth Bypass · Advisory · nats-io/nats-server · GitHub

Affected: v2.14.0, v2.12.7 and v2.11.16.

https://github.com/nats-io/nats-server/security/advisories/GHSA-38x3-76xf-cq45
github_release Patch Available

Release v2.14.0

Patch available: nats-io/nats-server v2.14.0

https://github.com/nats-io/nats-server/releases/tag/v2.14.0
github_release Patch Available

Release v2.12.7

Patch available: nats-io/nats-server v2.12.7

https://github.com/nats-io/nats-server/releases/tag/v2.12.7
github_release Patch Available

Release v2.11.16

Patch available: nats-io/nats-server v2.11.16

https://github.com/nats-io/nats-server/releases/tag/v2.11.16
github_commit

commit b86147e81710 (nats-io/nats-server)

Fix landed in nats-io/nats-server commit b86147e81710 — awaiting tagged release

https://github.com/nats-io/nats-server/commit/b86147e81710a52b72a7f7275f91d69f723f5cb3
github_commit

commit 8b8e1ad4ceed (nats-io/nats-server)

Fix landed in nats-io/nats-server commit 8b8e1ad4ceed — awaiting tagged release

https://github.com/nats-io/nats-server/commit/8b8e1ad4ceed32321e00d4fc6e76be05bc13bca6
github_commit

commit 7b81dd455ea9 (nats-io/nats-server)

Fix landed in nats-io/nats-server commit 7b81dd455ea9 — awaiting tagged release

https://github.com/nats-io/nats-server/commit/7b81dd455ea95960090a84858c7662827948d1b6

Vendor Advisories for CVE-2026-58253(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 28× in last 7d / 28× 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 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 07:04 UTCEG score recompute
  4. 2026-07-15 02:00 UTCEPSS rescore
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-14 20:00 UTCEG score recompute
  7. 2026-07-14 08:57 UTCEG score recompute
  8. 2026-07-13 22:31 UTCEPSS rescore
  9. 2026-07-13 21:54 UTCEG score recompute
  10. 2026-07-13 10:51 UTCEG score recompute
  11. 2026-07-13 06:13 UTCEPSS rescore
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-12 23:48 UTCEG score recompute
  14. 2026-07-12 12:45 UTCEG score recompute
  15. 2026-07-12 05:46 UTCEPSS rescore
  16. 2026-07-12 01:42 UTCEG score recompute
  17. 2026-07-11 14:38 UTCEG score recompute
  18. 2026-07-11 08:27 UTCEPSS rescore
  19. 2026-07-11 08:27 UTCEPSS rescore
  20. 2026-07-11 03:35 UTCEG score recompute
  21. 2026-07-10 16:32 UTCEG score recompute
  22. 2026-07-10 05:28 UTCEG score recompute
  23. 2026-07-09 19:10 UTCEPSS rescore
  24. 2026-07-09 19:10 UTCEPSS rescore
  25. 2026-07-09 18:24 UTCEG score recompute
Show 3 more
  1. 2026-07-09 07:19 UTCEG score recompute
  2. 2026-07-08 20:16 UTCEG score recompute
  3. 2026-07-08 20:14 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58253?
CVE-2026-58253 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 2.14.0, 2.12.7, and 2.11.16, when noauthuser was configured, a parser fast path intended for ordinary client connections could also apply to route or leafnode listeners, allowing an…
When was CVE-2026-58253 disclosed?
CVE-2026-58253 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-2026-58253 actively exploited?
CVE-2026-58253 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58253?
CVE-2026-58253 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-58253?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58253, 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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