CVE-2026-16100

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-05. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in the user-event metrics recording of Keycloak. When metrics are enabled, the system records raw error messages from failed account operations as Prometheus metric labels. Because these error messages can include user-supplied input like nonexistent client IDs, an authenticated user can create a massive number of unique metric entries, eventually exhausting system memory and causing the service to crash or become unavailable.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 5, 2026
Patch available. Sources: redhat.
redhat

2501730 – (CVE-2026-16100) CVE-2026-16100 keycloak-services: keycloak-services: Unbounded metric cardinality in user event metrics via request-controlled error text

https://bugzilla.redhat.com/show_bug.cgi?id=2501730
redhat Patch Available

CVE-2026-16100 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-16100

Vendor Advisories for CVE-2026-16100(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
redhatrhbk/keycloak-rhel9-operator:26.6-112026-08-05redhat
redhatrhbk-openshift-rhel9/rhbk-openshift-rhel92026-08-05redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 113× 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 183 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-16100?
CVE-2026-16100 is a medium vulnerability published on August 5, 2026. A flaw was found in the user-event metrics recording of Keycloak. When metrics are enabled, the system records raw error messages from failed account operations as Prometheus metric labels. Because these error messages can include user-supplied input like nonexistent client IDs, an authenticated…
When was CVE-2026-16100 disclosed?
CVE-2026-16100 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16100 actively exploited?
CVE-2026-16100 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 65.6% of all scored CVEs.
What is the CVSS score of CVE-2026-16100?
CVE-2026-16100 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-16100?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16100, 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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