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  4. CVE 2026 4634 keycloak keycloak denial of service via excessive
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Back to active CVEs
High · CVSS 7.5CVE-2026-4634

Keycloak: keycloak: denial of service via excessive processing of openid connect scope parametersCVE-2026-4634

Answer in brief

CVE-2026-4634 records a High severity (CVSS 7.5) vulnerability in Keycloak: keycloak: denial of service via excessive processing of openid connect scope parameters. The current sources do not mark it as known exploited. The current feed maps Red Hat/keycloak-services (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 2, 2026Updated Oct 26, 2026Source checked Nov 3, 2026First seen by HOL Jul 15, 2026Material review Oct 26, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
6 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/keycloak-services (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:redhat:build_of_keycloak:26.2.15:*:*:*:text-only:*:*:*Not reportedNot reported
cpe:2.3:a:redhat:build_of_keycloak:26.2:*:*:*:text-only:*:*:*Not reportedNot reported
cpe:2.3:a:redhat:build_of_keycloak:26.4.11:*:*:*:text-only:*:*:*Not reportedNot reported
cpe:2.3:a:redhat:build_of_keycloak:26.4:*:*:*:text-only:*:*:*Not reportedNot reported
cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:text-only:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/keycloak-servicesgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/keycloak-services.
  2. 2Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Evidence timeline and material changes

  1. Published upstream

    Apr 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 26, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jul 15, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencesecurity.access.redhat.com
Upstream source description

A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect (OIDC) token endpoint. This leads to high resource consumption and prolonged processing times, ultimately resulting in a Denial of Service (DoS) for the Keycloak server.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-1050
Source
CVE List V5
Source checked
Nov 3, 2026
References
12 linked sources
Open source record