CVE-2026-58211

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (20th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 client could be registered as the configured no_auth_user through a parser path used when the first client operation was not CONNECT, bypassing user-level connection restrictions such as allowed_connection_types or proxy_required that normal authentication would apply. This issue is fixed in versions 2.14.3 and 2.12.12.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity54% × 45%
The EG Score, 5.4 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
20th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 8, 2026

Last Modified

July 9, 2026

Advisory Details (1)

Auto-updated Jul 8, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

`no_auth_user` pre-CONNECT fast path bypasses user connection restrictions · Advisory · nats-io/nats-server · GitHub

Affected: v2.14.3 and v2.12.12.

https://github.com/nats-io/nats-server/security/advisories/GHSA-hmmp-q8cx-v964

Vendor Advisories for CVE-2026-58211(2)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatnats-server2-12-main-2.12.12-1.hum12026-07-06redhat
redhatnats-server2-14-main-2.14.3-1.hum12026-07-06redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
nats-server2.10.1-1 ... 2.9.19-1 (15 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
nats-server2.10.27-1 ... 2.14.6-1 (6 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
nats-server2.10.27-1, 2.12.4-1, 2.12.6-1, 2.14.1-1
  • every version up to 2.14.3-1: fixed in 2.14.3-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 40× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 153 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 53 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  3. 2026-10-12 15:53 UTCEG score recompute
  4. 2026-10-11 19:36 UTCEG score recompute
  5. 2026-10-11 16:52 UTCEG score recompute
  6. 2026-10-11 14:14 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-10-01 16:10 UTCEG score recompute
  19. 2026-10-01 16:10 UTCVendor advisory
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  23. 2026-09-28 13:21 UTCEG score recompute
  24. 2026-09-28 13:21 UTCVendor advisory
  25. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
Show 75 more
  1. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  2. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  3. 2026-09-24 11:47 UTCEG score recompute
  4. 2026-09-24 11:47 UTCVendor advisory
  5. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  6. 2026-09-23 06:05 UTCEG score recompute
  7. 2026-09-23 06:05 UTCVendor advisory
  8. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  9. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  10. 2026-09-18 05:42 UTCEG score recompute
  11. 2026-09-18 05:42 UTCVendor advisory
  12. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  13. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  14. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  15. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  16. 2026-09-14 11:15 UTCEG score recompute
  17. 2026-09-14 11:15 UTCVendor advisory
  18. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  19. 2026-09-13 08:23 UTCEG score recompute
  20. 2026-09-13 08:23 UTCVendor advisory
  21. 2026-09-12 03:31 UTCEG score recompute
  22. 2026-09-12 03:31 UTCVendor advisory
  23. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  24. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  25. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  26. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  27. 2026-09-05 22:46 UTCEG score recompute
  28. 2026-09-05 22:46 UTCVendor advisory
  29. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  30. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  31. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  32. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  33. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  34. 2026-08-30 07:28 UTCEG score recompute
  35. 2026-08-30 07:28 UTCVendor advisory
  36. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  37. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  38. 2026-08-27 21:49 UTCEG score recompute
  39. 2026-08-27 21:49 UTCVendor advisory
  40. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  41. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  42. 2026-08-26 04:52 UTCEG score recompute
  43. 2026-08-26 04:52 UTCVendor advisory
  44. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  45. 2026-08-24 22:45 UTCEG score recompute
  46. 2026-08-24 22:45 UTCVendor advisory
  47. 2026-08-23 20:56 UTCEG score recompute
  48. 2026-08-23 20:56 UTCVendor advisory
  49. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  50. 2026-08-22 19:09 UTCEG score recompute
  51. 2026-08-22 19:09 UTCVendor advisory
  52. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  53. 2026-08-21 17:23 UTCEG score recompute
  54. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  55. 2026-08-20 15:37 UTCEG score recompute
  56. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  57. 2026-08-19 12:33 UTCEG score recompute
  58. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  59. 2026-08-18 10:48 UTCEG score recompute
  60. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  61. 2026-08-17 06:05 UTCEG score recompute
  62. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  63. 2026-08-16 03:48 UTCEG score recompute
  64. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  65. 2026-08-15 02:01 UTCEG score recompute
  66. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  67. 2026-08-14 00:15 UTCEG score recompute
  68. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  69. 2026-08-12 22:29 UTCEG score recompute
  70. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 11th percentile
  71. 2026-08-11 20:43 UTCEG score recompute
  72. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  73. 2026-08-09 17:12 UTCEG score recompute
  74. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  75. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 10th percentile

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-58211?
CVE-2026-58211 is a medium-severity vulnerability; its CVE record was 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 client could be registered as the configured noauthuser through a parser path used when the first client operation was not CONNECT, bypassing user-level connection…
When was the CVE record for CVE-2026-58211 published?
The CVE record for CVE-2026-58211 was published on July 8, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 9, 2026; the record at its source may have been updated since.
Is CVE-2026-58211 actively exploited?
CVE-2026-58211 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (20th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58211?
CVE-2026-58211 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-58211?
A fix for CVE-2026-58211 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-58211 are linked in the Vendor Advisories panel on this page.

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