CVE-2026-58210

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (53rd 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
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: 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 2.12.12, 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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
53rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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 (5)

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

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

Vendor Advisories for CVE-2026-58210(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 / 39× 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 166 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 66 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 0.7% · 53rd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd 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 0.7% · 53rd percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  14. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  15. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  17. 2026-10-01 16:10 UTCEG score recompute
  18. 2026-10-01 16:10 UTCVendor advisory
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  22. 2026-09-28 13:21 UTCEG score recompute
  23. 2026-09-28 13:21 UTCVendor advisory
  24. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  25. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
Show 75 more
  1. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  2. 2026-09-24 11:47 UTCEG score recompute
  3. 2026-09-24 11:47 UTCVendor advisory
  4. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  5. 2026-09-23 06:06 UTCEG score recompute
  6. 2026-09-23 06:06 UTCVendor advisory
  7. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  8. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  9. 2026-09-18 05:42 UTCEG score recompute
  10. 2026-09-18 05:42 UTCVendor advisory
  11. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  12. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  13. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  14. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  15. 2026-09-14 11:15 UTCVendor advisory
  16. 2026-09-13 23:49 UTCEG score recompute
  17. 2026-09-13 23:49 UTCVendor advisory
  18. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  19. 2026-09-13 08:23 UTCEG score recompute
  20. 2026-09-13 08:23 UTCVendor advisory
  21. 2026-09-12 14:30 UTCVendor advisory
  22. 2026-09-12 03:31 UTCEG score recompute
  23. 2026-09-12 03:31 UTCVendor advisory
  24. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  25. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  26. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  27. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  28. 2026-09-06 14:02 UTCEG score recompute
  29. 2026-09-06 14:02 UTCVendor advisory
  30. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  31. 2026-09-05 22:46 UTCEG score recompute
  32. 2026-09-05 22:46 UTCVendor advisory
  33. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  34. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  35. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  36. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  37. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  38. 2026-08-30 18:28 UTCVendor advisory
  39. 2026-08-30 07:29 UTCEG score recompute
  40. 2026-08-30 07:29 UTCVendor advisory
  41. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  42. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  43. 2026-08-27 21:49 UTCEG score recompute
  44. 2026-08-27 21:49 UTCVendor advisory
  45. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  46. 2026-08-27 01:26 UTCEG score recompute
  47. 2026-08-27 01:26 UTCVendor advisory
  48. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  49. 2026-08-26 04:52 UTCEG score recompute
  50. 2026-08-26 04:52 UTCVendor advisory
  51. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  52. 2026-08-24 20:40 UTCEG score recompute
  53. 2026-08-24 09:41 UTCEG score recompute
  54. 2026-08-23 10:57 UTCEG score recompute
  55. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  56. 2026-08-22 01:56 UTCEG score recompute
  57. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  58. 2026-08-21 03:58 UTCEG score recompute
  59. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  60. 2026-08-20 01:57 UTCEG score recompute
  61. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  62. 2026-08-18 20:44 UTCEG score recompute
  63. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  64. 2026-08-17 15:24 UTCEG score recompute
  65. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  66. 2026-08-16 17:26 UTCEG score recompute
  67. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  68. 2026-08-16 06:27 UTCEG score recompute
  69. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  70. 2026-08-15 08:30 UTCEG score recompute
  71. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  72. 2026-08-13 23:34 UTCEG score recompute
  73. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  74. 2026-08-12 14:33 UTCEG score recompute
  75. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile

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

Frequently asked(5)

What is CVE-2026-58210?
CVE-2026-58210 is a high-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, 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 the CVE record for CVE-2026-58210 published?
The CVE record for CVE-2026-58210 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-2026-58210 actively exploited?
CVE-2026-58210 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-58210?
CVE-2026-58210 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-58210?
A fix for CVE-2026-58210 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-58210 are linked in the Vendor Advisories panel on this page.

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