CVE-2026-58209

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% 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
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

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, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these delivery paths did not consistently recheck the concrete original topic before sending the MQTT PUBLISH to the subscriber. This issue is fixed in versions 2.14.3 and 2.12.12.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
19(Track)
EG Risk 19/100SSVC: Track

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
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

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 Patch Available

MQTT retained and QoS replay bypass subscribe deny filters · Advisory · nats-io/nats-server · GitHub

Affected: v2.14.3 and v2.12.12.

https://github.com/nats-io/nats-server/security/advisories/GHSA-7qmq-8cc4-hxwg
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 1c429b6fdc5a (nats-io/nats-server)

Fix landed in nats-io/nats-server commit 1c429b6fdc5a — awaiting tagged release

https://github.com/nats-io/nats-server/commit/1c429b6fdc5afd4188cc5faf1127f6334896cd87
github_commit

commit 181b1f51f40b (nats-io/nats-server)

Fix landed in nats-io/nats-server commit 181b1f51f40b — awaiting tagged release

https://github.com/nats-io/nats-server/commit/181b1f51f40b9954c57e9d478e051fb257679356

Vendor Advisories for CVE-2026-58209(3)

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 / EcosystemFixed in / 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 rangeFixed inDependents
nats-server2.10.1-1 ... 2.9.19-1 (14 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nats-server2.10.27-1, 2.12.4-1, 2.12.6-1, 2.14.1-1, 2.14.3-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nats-server2.10.27-1, 2.12.4-1, 2.12.6-1, 2.14.1-12.14.3-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 75× 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.

Showing the most recent 100 of 125 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-58209?
CVE-2026-58209 is a medium 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 2.14.3 and 2.12.12, MQTT retained message delivery and QoS1+ durable replay could deliver messages whose original topics matched a subscriber configured subscribe deny rule because these…
When was CVE-2026-58209 disclosed?
CVE-2026-58209 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-2026-58209 actively exploited?
CVE-2026-58209 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 73.1% of all scored CVEs.
What is the CVSS score of CVE-2026-58209?
CVE-2026-58209 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-58209?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58209, 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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