CVE-2026-33218

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 53% 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable leafnode support if not needed or restrict network connections to the leafnode port, if plausible without compromising the service offered.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

March 25, 2026

Last Modified

September 9, 2026

Advisory Details (8)

Auto-updated Jul 3, 2026
Patch available. Sources: github, redhat.
redhat Patch Available
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33218.json
redhat

2451450 – (CVE-2026-33218) CVE-2026-33218 nats-server: github.com/nats-io/nats-server: NATS-Server: Denial of Service via malformed message pre-authentication on leafnode port

https://bugzilla.redhat.com/show_bug.cgi?id=2451450
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-33218
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:23345
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:22347
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:21769
github Patch Available

Pre-auth server panic in leafnode handling · Advisory · nats-io/nats-server · GitHub

https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339
generic
https://advisories.nats.io/CVE/secnote-2026-10.txt

Vendor Advisories for CVE-2026-33218(3)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17801671182026-06-04redhat
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17795794392026-06-01redhat
redhatmulticluster-globalhub/multicluster-globalhub-grafana-rhel9:17788677532026-05-28redhat

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

(5 across 4 ecosystems)
Go(2)
PackageVulnerable rangeFixed inDependents
github.com/nats-io/nats-server———
github.com/nats-io/nats-server/v2—2.12.6—
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, 2.12.4-12.12.6-1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 40× 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 149 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-33218?
CVE-2026-33218 is a high vulnerability published on March 25, 2026. NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a…
When was CVE-2026-33218 disclosed?
CVE-2026-33218 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33218 actively exploited?
CVE-2026-33218 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.9% of all scored CVEs.
What is the CVSS score of CVE-2026-33218?
CVE-2026-33218 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-33218?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33218, 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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