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
Trending — 3 sources updated this week
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
47%
KEV
Not listed

Published

March 25, 2026

Last Modified

August 24, 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 11× in last 7d / 78× 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 119 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-24 14:17 UTCEPSS rescore
  3. 2026-08-24 13:31 UTCEG score recompute
  4. 2026-08-24 13:31 UTCVendor advisory
  5. 2026-08-24 12:27 UTCEG score recompute
  6. 2026-08-24 12:27 UTCVendor advisory
  7. 2026-08-23 00:19 UTCEPSS rescore
  8. 2026-08-21 23:49 UTCEPSS rescore
  9. 2026-08-20 22:55 UTCEPSS rescore
  10. 2026-08-20 22:55 UTCEPSS rescore
  11. 2026-08-19 17:03 UTCEPSS rescore
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 12:21 UTCEG score recompute
  15. 2026-08-17 12:21 UTCVendor advisory
  16. 2026-08-17 12:13 UTCEG score recompute
  17. 2026-08-17 12:13 UTCVendor advisory
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 10:13 UTCEG score recompute
  20. 2026-08-16 10:13 UTCVendor advisory
  21. 2026-08-16 02:14 UTCEPSS rescore
  22. 2026-08-15 01:30 UTCEPSS rescore
  23. 2026-08-15 00:53 UTCVendor advisory
  24. 2026-08-14 13:28 UTCEG score recompute
  25. 2026-08-14 13:28 UTCVendor advisory
Show 75 more
  1. 2026-08-14 12:30 UTCEG score recompute
  2. 2026-08-14 12:30 UTCVendor advisory
  3. 2026-08-14 06:31 UTCEG score recompute
  4. 2026-08-14 06:31 UTCVendor advisory
  5. 2026-08-13 22:00 UTCEPSS rescore
  6. 2026-08-12 20:48 UTCEG score recompute
  7. 2026-08-12 20:48 UTCVendor advisory
  8. 2026-08-12 13:50 UTCEPSS rescore
  9. 2026-08-11 20:52 UTCEG score recompute
  10. 2026-08-11 20:52 UTCVendor advisory
  11. 2026-08-11 03:55 UTCEG score recompute
  12. 2026-08-11 03:55 UTCVendor advisory
  13. 2026-08-11 00:00 UTCEPSS rescore
  14. 2026-08-10 13:22 UTCEG score recompute
  15. 2026-08-10 13:22 UTCVendor advisory
  16. 2026-08-10 12:27 UTCEG score recompute
  17. 2026-08-10 12:27 UTCVendor advisory
  18. 2026-08-10 04:57 UTCVendor advisory
  19. 2026-08-09 17:32 UTCEG score recompute
  20. 2026-08-09 17:32 UTCVendor advisory
  21. 2026-08-09 13:46 UTCEPSS rescore
  22. 2026-08-09 06:07 UTCEG score recompute
  23. 2026-08-09 06:07 UTCVendor advisory
  24. 2026-08-08 16:37 UTCEPSS rescore
  25. 2026-08-08 03:51 UTCEG score recompute
  26. 2026-08-08 03:51 UTCVendor advisory
  27. 2026-08-07 16:27 UTCVendor advisory
  28. 2026-08-06 18:50 UTCEG score recompute
  29. 2026-08-06 18:50 UTCVendor advisory
  30. 2026-08-06 13:46 UTCEPSS rescore
  31. 2026-08-06 00:57 UTCEG score recompute
  32. 2026-08-06 00:57 UTCVendor advisory
  33. 2026-08-05 19:17 UTCEPSS rescore
  34. 2026-08-04 15:10 UTCEPSS rescore
  35. 2026-08-04 10:38 UTCEPSS rescore
  36. 2026-08-04 01:08 UTCVendor advisory
  37. 2026-08-03 13:44 UTCEG score recompute
  38. 2026-08-03 13:44 UTCVendor advisory
  39. 2026-08-03 12:49 UTCEG score recompute
  40. 2026-08-03 12:49 UTCVendor advisory
  41. 2026-08-03 10:36 UTCEPSS rescore
  42. 2026-08-03 03:01 UTCVendor advisory
  43. 2026-08-02 15:27 UTCEG score recompute
  44. 2026-08-02 15:27 UTCVendor advisory
  45. 2026-08-02 02:27 UTCEPSS rescore
  46. 2026-08-01 04:16 UTCEPSS rescore
  47. 2026-07-30 16:28 UTCEPSS rescore
  48. 2026-07-30 01:30 UTCEPSS rescore
  49. 2026-07-27 14:13 UTCEPSS rescore
  50. 2026-07-27 13:31 UTCEG score recompute
  51. 2026-07-27 13:31 UTCVendor advisory
  52. 2026-07-27 12:41 UTCEG score recompute
  53. 2026-07-27 12:41 UTCVendor advisory
  54. 2026-07-26 14:54 UTCEPSS rescore
  55. 2026-07-26 14:54 UTCEPSS rescore
  56. 2026-07-25 14:18 UTCEPSS rescore
  57. 2026-07-25 14:18 UTCEPSS rescore
  58. 2026-07-24 14:17 UTCEPSS rescore
  59. 2026-07-24 14:17 UTCEPSS rescore
  60. 2026-07-23 14:18 UTCEPSS rescore
  61. 2026-07-23 14:18 UTCEPSS rescore
  62. 2026-07-23 03:09 UTCEG score recompute
  63. 2026-07-22 14:08 UTCEPSS rescore
  64. 2026-07-21 15:24 UTCEPSS rescore
  65. 2026-07-20 17:08 UTCEPSS rescore
  66. 2026-07-19 14:31 UTCEPSS rescore
  67. 2026-07-19 02:29 UTCEPSS rescore
  68. 2026-07-18 10:04 UTCEPSS rescore
  69. 2026-07-18 06:59 UTCOSV refresh
  70. 2026-07-16 17:03 UTCEPSS rescore
  71. 2026-07-16 17:03 UTCEPSS rescore
  72. 2026-07-15 16:57 UTCEPSS rescore
  73. 2026-07-15 16:57 UTCEPSS rescore
  74. 2026-07-15 02:00 UTCEPSS rescore
  75. 2026-07-15 02:00 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 August 24, 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 53.2% 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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