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Full vulnerability report · 2026
CVE-2026-4634High confidence

Keycloak: keycloak: denial of service via excessive processing of openid connect scope parameters

Red Hat · Red Hat build of Keycloak 26.2

Official source articles: Red Hat RHSA-2026:6475 ↗ · Red Hat RHSA-2026:6476 ↗ · Red Hat RHSA-2026:6477 ↗ · Red Hat RHSA-2026:6478 ↗. Check the applicable product and release in the original source.

7.5HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.84% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Red Hat Red Hat build of Keycloak 26.2 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Open-source package ranges2 source-attributed ranges

These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.

Ecosystem and packageAffected rangeFirst fixed versionEvidence
Mavenorg.keycloak:keycloak-servicesECOSYSTEM: introduced 0; fixed 26.5.726.5.7OSV record ↗aggregator derived · 10 Sep 2026
mavenorg.keycloak:keycloak-services< 26.5.726.5.7GitHub advisory ↗github reviewed aggregator · 4 Apr 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-4634 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitykeycloak: Keycloak: Denial of Service via excessive processing of OpenID Connect scope parameters
24 fixed

The vendor explicitly identifies these products or versions as containing the fix.

  • rh-sso-7/sso76-openshift-rhel8@sha256:3c851f2398ba67beb5b9ca55d984010262b35bf9d659f279829abd33da01a7ac_ppc64le as a component of Middleware Containers for OpenShift
  • rh-sso-7/sso76-openshift-rhel8@sha256:c5afebef31c670ec67dab77ebaef767778c89c88be00f108cc435773fc42a993_amd64 as a component of Middleware Containers for OpenShift
  • rh-sso-7/sso76-openshift-rhel8@sha256:d466be5920b7e34edbca61e8e565dce1e8139b22481fa1d1b8f98d79acc946dc_s390x as a component of Middleware Containers for OpenShift
  • rhbk/keycloak-operator-bundle@sha256:d80f27078e17321d4b194820a9c325c47b8cc3e431ac37c84a6c5b2b52b009e6_amd64 as a component of Red Hat build of Keycloak 26.2
  • rhbk/keycloak-rhel9-operator@sha256:1880e406eab1303dd1faa08694ff2cb33901e1e69272a2f9cdf5f5af6941bd84_arm64 as a component of Red Hat build of Keycloak 26.2
  • rhbk/keycloak-rhel9-operator@sha256:31378e237970d0c5c483ec2dd3de6a39adfb7cdfe13c5d106be39088859271e6_amd64 as a component of Red Hat build of Keycloak 26.2
  • rhbk/keycloak-rhel9-operator@sha256:47fa46896eda2f3c51657f6bc9a024d63f3d306f4726ead3fa46ef5796696e07_ppc64le as a component of Red Hat build of Keycloak 26.2
  • rhbk/keycloak-rhel9-operator@sha256:6c0c1d05bb893e1d598ffc5e953f1287d36e78f6b1938c430e0bc19e22343ae4_s390x as a component of Red Hat build of Keycloak 26.2
  • rhbk/keycloak-rhel9@sha256:10b97dd8e38ce50457a121e53d53472877cc3aa185e7c4b23da191c00e914af2_arm64 as a component of Red Hat build of Keycloak 26.2
  • rhbk/keycloak-rhel9@sha256:4065d584a57daa2aa2259afa19844f6308e2f6a252b08738c809002cc84aa606_s390x as a component of Red Hat build of Keycloak 26.2
  • rhbk/keycloak-rhel9@sha256:4c4f3e098f715efc174a4a01803b7133ca7c2b744ea4b8151c7edcae608d9531_ppc64le as a component of Red Hat build of Keycloak 26.2
  • rhbk/keycloak-rhel9@sha256:b3fe3f4c74e96a2daf735fe5e8df98b2fa6f023cfda0c7cd4915a83556e14efb_amd64 as a component of Red Hat build of Keycloak 26.2
Summary
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.
Remediation
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-18212

No EUVD known-exploited evidence

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.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
7.5 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

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.

What

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.

Why

The product has a loop body or loop condition that contains a control element that directly or indirectly consumes platform resources, e.g. messaging, sessions, locks, or file descriptors.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

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.

Why

The product has a loop body or loop condition that contains a control element that directly or indirectly consumes platform resources, e.g. messaging, sessions, locks, or file descriptors.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Excessive Platform Resource Consumption within a Loop → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-1050 ↗

CWE-1050: Excessive Platform Resource Consumption within a Loop. The product has a loop body or loop condition that contains a control element that directly or indirectly consumes platform resources, e.g. messaging, sessions, locks, or file descriptors.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
Stolen credentials, tokens and legitimate administration functions may provide continued access without deploying a large custom toolset.
NetworkUnauthenticatedDenial of serviceCWE-1050
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-18212Official EUVD mapping

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.

Official EUVD record ↗
BSI · German · WID-SEC-2026-0977Keycloak: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Daten zu manipulieren, und um Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-011681レッドハットのbuild of keycloakにおけるループ内の過剰なプラットフォームリソース消費に関する脆弱性

Keycloakに脆弱性が発見されました。認証されていない攻撃者が、過剰に長いscopeパラメータを含む特別に細工されたPOSTリクエストをOpenID Connect（OIDC）のトークンエンドポイントに送信することで、この脆弱性を悪用できます。これにより、高いリソース消費と処理時間の長期化が引き起こされ、最終的にKeycloakサーバーがサービス拒否（DoS）状態になります。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-026852Hitachi Ops Center Common Servicesにおける複数の脆弱性

Hitachi Ops Center Common Servicesに下記の脆弱性が存在します。 CVE-2025-10939, CVE-2025-11537, CVE-2025-11538, CVE-2025-12110, CVE-2025-13467, CVE-2025-13881, CVE-2025-14082, CVE-2025-14083, CVE-2025-14777, CVE-2025-66560, CVE-2026-0707, CVE-2026-0871, CVE-2026-0976, CVE-2026-1035, CVE-2026-1190, CVE-2026-2092, CVE-2026-2575, CVE-2026-2673, CVE-2026-3009, CVE-2026-3121, CVE-2026-3429, CVE-2026-3872, CVE-2026-3911, CVE-2026-4282, CVE-2026-4325, CVE-2026-4634, CVE-2026-22745, CVE-2026-22748, CVE-2026-25854, CVE-2026-40972, CVE-2026-40975

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 2 Apr 2026 · Last source change 6 Oct 2026, 11:46 UTC · CWE-1050 · Excessive Platform Resource Consumption within a Loop

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-18212
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment

Missing structured fields: affected versions. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:6475; removed remediation: access.redhat.com/RHSA-2026:76129; removed vendor advisory: access.redhat.com/RHSA-2026:76129; 1 further removals.
    Before
    remediation: access.redhat.com/RHSA-2026:76129 · vendor advisory: access.redhat.com/CVE-2026-4634 · vendor advisory: access.redhat.com/RHSA-2026:6475 · 6 more references
    After
    remediation: access.redhat.com/RHSA-2026:6475 · vendor advisory: access.redhat.com/CVE-2026-4634 · vendor advisory: access.redhat.com/RHSA-2026:6475 · 4 more references
    access.redhat.com ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:76129; added vendor advisory: access.redhat.com/RHSA-2026:76129; removed remediation: access.redhat.com/RHSA-2026:6475; 1 further additions.
    Before
    remediation: access.redhat.com/RHSA-2026:6475 · vendor advisory: access.redhat.com/CVE-2026-4634 · vendor advisory: access.redhat.com/RHSA-2026:6475 · 4 more references
    After
    remediation: access.redhat.com/RHSA-2026:76129 · vendor advisory: access.redhat.com/CVE-2026-4634 · vendor advisory: access.redhat.com/RHSA-2026:6475 · 6 more references
    access.redhat.com ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: Red Hat build of Keycloak 26.2: 26.2.15-1 < *, 26.2-18 < *; Red Hat build of Keycloak 26.4: 26.4.11-1 < *, 26.4-14 < *; RHEL-8 based Middleware Containers: 7.6-85 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat build of Keycloak 26.2: 26.2.15-1 < *, 26.2-18 < *; Red Hat build of Keycloak 26.4: 26.4.11-1 < *, 26.4-14 < *; Red Hat Single Sign-On 7.6 for RHEL 8: 0:18.0.20-1.redhat_00001.1.el8sso < *; Red Hat Single Sign-On 7.6 for RHEL 9: 0:18.0.20-1.redhat_00001.1.el9sso < *; RHEL-8 based Middleware Containers: 7.6-85 < *
    CNA ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: Red Hat build of Keycloak 26.2: 26.2.15-1 < *, 26.2-18 < *; Red Hat build of Keycloak 26.4: 26.4.11-1 < *, 26.4-14 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat build of Keycloak 26.2: 26.2.15-1 < *, 26.2-18 < *; Red Hat build of Keycloak 26.4: 26.4.11-1 < *, 26.4-14 < *; RHEL-8 based Middleware Containers: 7.6-85 < *
    CNA ↗
  5. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-4634 to remediation: access.redhat.com/CVE-2026-4634.
    Before
    remediation: access.redhat.com/CVE-2026-4634
    After
    remediation: access.redhat.com/CVE-2026-4634
    Red Hat Product Security ↗
  6. Affected versionsThe structured affected or fixed version information changed.
    Before
    keycloak-services as a component of Red Hat Single Sign-On 7 · Fixed: rhbk/keycloak-operator-bundle@sha256:d80f27078e17321d4b194820a9c325c47b8cc3e431ac37c84a6c5b2b52b009e6_amd64 as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9-operator@sha256:1880e406eab1303dd1faa08694ff2cb33901e1e69272a2f9cdf5f5af6941bd84_arm64 as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9-operator@sha256:31378e237970d0c5c483ec2dd3de6a39adfb7cdfe13c5d106be39088859271e6_amd64 as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9-operator@sha256:47fa46896eda2f3c51657f6bc9a024d63f3d306f4726ead3fa46ef5796696e07_ppc64le as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9-operator@sha256:6c0c1d05bb893e1d598ffc5e953f1287d36e78f6b1938c430e0bc19e22343ae4_s390x as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9@sha256:10b97dd8e38ce50457a121e53d53472877cc3aa185e7c4b23da191c00e914af2_arm64 as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9@sha256:4065d584a57daa2aa2259afa19844f6308e2f6a252b08738c809002cc84aa606_s390x as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9@sha256:4c4f3e098f715efc174a4a01803b7133ca7c2b744ea4b8151c7edcae608d9531_ppc64le as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9@sha256:b3fe3f4c74e96a2daf735fe5e8df98b2fa6f023cfda0c7cd4915a83556e14efb_amd64 as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-operator-bundle@sha256:7fb041b0e2b43954c3a83b58fd885b1cdc5bb32275e06c4c72955da5b78255c3_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:0d90a1c28652b5f73ea90f78968548178cf710121fcb13774a467aeb9c30ab09_s390x as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:1a7ac3c798d83cc37dd750ed44223630f4ebff937534a59a9e9ad029dbf31a0f_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:715a5c6cc9061fc0305370a33f5b69a96ba7bfdb23b706a567b489fc05b05e06_ppc64le as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:c68d195c2d19568d9789648ef347a3388da453c83120d696453333c34a564347_arm64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:33fc8c6edb3c5c2df302ea53a89454320e08ff4660ba84d0a78f6c67178dfb16_s390x as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:a4cb583985eb220ad05b1983a98a5a50e2b76c15e6f56152045591e3994f37d1_ppc64le as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:c1c1cb36f70ca142a789b359f9a120d321f58adc44e2c97a49c2d6f270d15bd9_arm64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:dc54248ad9357fbd737e6983e6d8d0c7e845e39ed6558bd7c39f7a7573459489_amd64 as a component of Red Hat build of Keycloak 26.4; Red Hat build of Keycloak 26.2.15; Red Hat build of Keycloak 26.4.11
    After
    Fixed: rh-sso-7/sso76-openshift-rhel8@sha256:3c851f2398ba67beb5b9ca55d984010262b35bf9d659f279829abd33da01a7ac_ppc64le as a component of Middleware Containers for OpenShift; rh-sso-7/sso76-openshift-rhel8@sha256:c5afebef31c670ec67dab77ebaef767778c89c88be00f108cc435773fc42a993_amd64 as a component of Middleware Containers for OpenShift; rh-sso-7/sso76-openshift-rhel8@sha256:d466be5920b7e34edbca61e8e565dce1e8139b22481fa1d1b8f98d79acc946dc_s390x as a component of Middleware Containers for OpenShift; rhbk/keycloak-operator-bundle@sha256:d80f27078e17321d4b194820a9c325c47b8cc3e431ac37c84a6c5b2b52b009e6_amd64 as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9-operator@sha256:1880e406eab1303dd1faa08694ff2cb33901e1e69272a2f9cdf5f5af6941bd84_arm64 as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9-operator@sha256:31378e237970d0c5c483ec2dd3de6a39adfb7cdfe13c5d106be39088859271e6_amd64 as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9-operator@sha256:47fa46896eda2f3c51657f6bc9a024d63f3d306f4726ead3fa46ef5796696e07_ppc64le as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9-operator@sha256:6c0c1d05bb893e1d598ffc5e953f1287d36e78f6b1938c430e0bc19e22343ae4_s390x as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9@sha256:10b97dd8e38ce50457a121e53d53472877cc3aa185e7c4b23da191c00e914af2_arm64 as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9@sha256:4065d584a57daa2aa2259afa19844f6308e2f6a252b08738c809002cc84aa606_s390x as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9@sha256:4c4f3e098f715efc174a4a01803b7133ca7c2b744ea4b8151c7edcae608d9531_ppc64le as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-rhel9@sha256:b3fe3f4c74e96a2daf735fe5e8df98b2fa6f023cfda0c7cd4915a83556e14efb_amd64 as a component of Red Hat build of Keycloak 26.2; rhbk/keycloak-operator-bundle@sha256:7fb041b0e2b43954c3a83b58fd885b1cdc5bb32275e06c4c72955da5b78255c3_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:0d90a1c28652b5f73ea90f78968548178cf710121fcb13774a467aeb9c30ab09_s390x as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:1a7ac3c798d83cc37dd750ed44223630f4ebff937534a59a9e9ad029dbf31a0f_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:715a5c6cc9061fc0305370a33f5b69a96ba7bfdb23b706a567b489fc05b05e06_ppc64le as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:c68d195c2d19568d9789648ef347a3388da453c83120d696453333c34a564347_arm64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:33fc8c6edb3c5c2df302ea53a89454320e08ff4660ba84d0a78f6c67178dfb16_s390x as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:a4cb583985eb220ad05b1983a98a5a50e2b76c15e6f56152045591e3994f37d1_ppc64le as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:c1c1cb36f70ca142a789b359f9a120d321f58adc44e2c97a49c2d6f270d15bd9_arm64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:dc54248ad9357fbd737e6983e6d8d0c7e845e39ed6558bd7c39f7a7573459489_amd64 as a component of Red Hat build of Keycloak 26.4; Red Hat Single Sign-On 7.6.13; Red Hat build of Keycloak 26.2.15; Red Hat build of Keycloak 26.4.11
    Red Hat Product Security ↗
  7. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 26.2.15-1 < *; 26.2-18 < *; 26.4.11-1 < *; 26.4-14 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat build of Keycloak 26.2: 26.2.15-1 < *, 26.2-18 < *; Red Hat build of Keycloak 26.4: 26.4.11-1 < *, 26.4-14 < *
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-18212↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference · Red Hat RHSA-2026:6475↗Vendor advisory · Red Hat RHSA-2026:6476↗Vendor advisory · Red Hat RHSA-2026:6477↗Vendor advisory · Red Hat RHSA-2026:6478↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-4634 · cve.blacktree.nl