CVE-2026-9801

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreMEDIUM confidence

Score 4.9 from GitHub Security Advisory published 2026-05-28. a secondary CVSS source baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
4.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.9Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in Keycloak. A remote attacker with high privileges, such as a realm administrator configuring a malicious Lightweight Directory Access Protocol (LDAP) server or an attacker compromising an upstream LDAP server, could exploit this vulnerability. By sending a malformed LDAP password policy response during a password authentication request, the attacker can trigger an OutOfMemoryError. This causes the Keycloak Java Virtual Machine (JVM) to terminate, leading to a denial of service (DoS) for all realms on the affected node.

CVSS v3
4.9
EG Score
4.9(medium)
EG Risk
22(Track)
EG Risk 22/100SSVC: 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
Severity49% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

May 28, 2026

Last Modified

June 26, 2026

Advisory Details (4)

Auto-updated Jun 15, 2026
Patch available. Sources: redhat.
redhat

2482473 – (CVE-2026-9801) CVE-2026-9801 keycloak: Keycloak: Denial of Service via malformed LDAP password policy response

https://bugzilla.redhat.com/show_bug.cgi?id=2482473
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-9801
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:25098
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:25097

Vendor Advisories for CVE-2026-9801(5)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhbk/keycloak-rhel9-operator:26.4-192026-06-25redhat
redhatrhbk/keycloak-rhel92026-06-25redhat
redhatrhbk/keycloak-operator-bundle:26.6.4-22026-06-25redhat
redhatrhbk/keycloak-rhel9-operator:26.6-62026-06-10redhat

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

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.keycloak:keycloak-ldap-federation1.0-beta-4 ... 9.0.3 (217 versions)26.6.3—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 56× 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 182 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-9801?
CVE-2026-9801 is a medium vulnerability published on May 28, 2026. A flaw was found in Keycloak. A remote attacker with high privileges, such as a realm administrator configuring a malicious Lightweight Directory Access Protocol (LDAP) server or an attacker compromising an upstream LDAP server, could exploit this vulnerability. By sending a malformed LDAP password…
When was CVE-2026-9801 disclosed?
CVE-2026-9801 was first published in the National Vulnerability Database on May 28, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9801 actively exploited?
CVE-2026-9801 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 60.5% of all scored CVEs.
What is the CVSS score of CVE-2026-9801?
CVE-2026-9801 has a CVSS v3 base score of 4.9 (NVD).
How do I remediate CVE-2026-9801?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9801, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-9801

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