CVE-2026-16100

mediumpriority · track · 0EPSS 0.006 · 46 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.55% (46th) EPSS

CVSS 6.5 · medium

Is it mine?

12 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · secalert@redhat.com USexploitability 2.8 · impact 3.6

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USprimary

affected products (12)

Products and version ranges known to be affected.

Open Source Keycloak Red Hat build of Keycloa <26.4-22all versionscert_bundDE
Open Source Keycloak Red Hat build of Keycloa <26.4.14-1all versionscert_bundDE
Open Source Keycloak Red Hat build of Keycloa <26.6-11all versionscert_bundDE
Open Source Keycloak Red Hat build of Keycloa <26.6.5-1all versionscert_bundDE
Open Source Keycloak≤ Red Hat build of Keycloa <26.6-11cert_bundDE
Open Source Keycloak≤ Red Hat build of Keycloa <26.4-22cert_bundDE
Open Source Keycloak≤ Red Hat build of Keycloa <26.4.14-1cert_bundDE
Open Source Keycloak≤ Red Hat build of Keycloa <26.6.5-1cert_bundDE
Red Hat Red Hat build of Keycloak 26.6< 26.6-11enisa_euvdEU
Red Hat Red Hat build of Keycloak 26.6< 26.6.5-1enisa_euvdEU
redhat build of keycloak26.6 → 26.6.5nvdUScpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*
Bitnami keycloak26.6.0 → 26.6.5osvUSpkg:bitnami/keycloak

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2677RedHat Build of Keycloak: Mehrere SchwachstellenDeutsch2026-08-05csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um Administratorrechte zu erlangen, Benutzerkonten zu übernehmen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, Daten zu manipulieren oder einen Denial-of-Service-Zustand herbeizuführen.
BIT-keycloak-2026-16100Keycloak-services: keycloak-services: unbounded metric cardinality in user event metrics via request-controlled error text2026-08-25vendor · osvUS
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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2026-08-05modified 2026-08-31

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+3263 more

references (12)

External citations — patches, advisories, analysis.

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