CVE-2026-58254

MEDIUMNVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.3% (21st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
6.5EG
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: 6.5Exploit: 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 2.12.8, 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
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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)
Severity65% × 45%
The EG Score, 6.5 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
21st
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 13, 2026

Advisory Details (4)

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

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

Vendor Advisories for CVE-2026-58254(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-server2-14-main-2.14.3-1.hum12026-07-06redhat
redhatnats-server2-12-main-2.12.12-1.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 / 42× 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% · 21st percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 21st 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% · 21st percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 21st 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% · 21st percentile
  21. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 21st 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% · 21st percentile
Show 75 more
  1. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 20th 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% · 23rd percentile
  6. 2026-09-23 06:06 UTCEG score recompute
  7. 2026-09-23 06:06 UTCVendor advisory
  8. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 23rd 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% · 23rd percentile
  13. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  14. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  15. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 23rd 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% · 23rd 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. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  24. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  25. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  26. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  27. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  28. 2026-09-05 22:46 UTCEG score recompute
  29. 2026-09-05 22:46 UTCVendor advisory
  30. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  31. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  32. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  33. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  34. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  35. 2026-08-30 07:29 UTCEG score recompute
  36. 2026-08-30 07:29 UTCVendor advisory
  37. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  38. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  39. 2026-08-27 21:49 UTCEG score recompute
  40. 2026-08-27 21:49 UTCVendor advisory
  41. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  42. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  43. 2026-08-26 08:21 UTCEG score recompute
  44. 2026-08-26 08:21 UTCVendor advisory
  45. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  46. 2026-08-24 23:38 UTCEG score recompute
  47. 2026-08-24 23:38 UTCVendor advisory
  48. 2026-08-23 21:37 UTCEG score recompute
  49. 2026-08-23 21:37 UTCVendor advisory
  50. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  51. 2026-08-22 19:38 UTCEG score recompute
  52. 2026-08-22 19:38 UTCVendor advisory
  53. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  54. 2026-08-21 17:37 UTCEG score recompute
  55. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  56. 2026-08-20 15:37 UTCEG score recompute
  57. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  58. 2026-08-18 10:49 UTCEG score recompute
  59. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  60. 2026-08-17 08:46 UTCEG score recompute
  61. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  62. 2026-08-16 06:47 UTCEG score recompute
  63. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  64. 2026-08-15 04:48 UTCEG score recompute
  65. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  66. 2026-08-14 02:47 UTCEG score recompute
  67. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  68. 2026-08-13 00:47 UTCEG score recompute
  69. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  70. 2026-08-11 22:48 UTCEG score recompute
  71. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  72. 2026-08-09 18:48 UTCEG score recompute
  73. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  74. 2026-08-08 16:49 UTCEG score recompute
  75. 2026-08-07 14:49 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-58254?
CVE-2026-58254 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 2.12.8, message trace destination checks were applied to ordinary client connections but not consistently to messages arriving through leafnode connections, allowing a leafnode…
When was the CVE record for CVE-2026-58254 published?
The CVE record for CVE-2026-58254 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 13, 2026; the record at its source may have been updated since.
Is CVE-2026-58254 actively exploited?
CVE-2026-58254 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (21st percentile of EPSS-scored CVEs).
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?
A fix for CVE-2026-58254 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-58254 are linked in the Vendor Advisories panel on this page.

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