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Vulnerability details: VCID-6n3p-8y8x-bbfc
Vulnerability ID VCID-6n3p-8y8x-bbfc
Aliases CVE-2026-4634
GHSA-h4wv-g838-66g3
Summary Keycloak: Application-Level DoS via Scope Processing
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-1050 Excessive Platform Resource Consumption within a Loop
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3.1 7.5 https://access.redhat.com/errata/RHSA-2026:6475
generic_textual HIGH https://access.redhat.com/errata/RHSA-2026:6475
ssvc Track https://access.redhat.com/errata/RHSA-2026:6475
cvssv3.1 7.5 https://access.redhat.com/errata/RHSA-2026:6476
generic_textual HIGH https://access.redhat.com/errata/RHSA-2026:6476
ssvc Track https://access.redhat.com/errata/RHSA-2026:6476
cvssv3.1 7.5 https://access.redhat.com/errata/RHSA-2026:6477
generic_textual HIGH https://access.redhat.com/errata/RHSA-2026:6477
ssvc Track https://access.redhat.com/errata/RHSA-2026:6477
cvssv3.1 7.5 https://access.redhat.com/errata/RHSA-2026:6478
generic_textual HIGH https://access.redhat.com/errata/RHSA-2026:6478
ssvc Track https://access.redhat.com/errata/RHSA-2026:6478
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-4634.json
cvssv3.1 7.5 https://access.redhat.com/security/cve/CVE-2026-4634
generic_textual HIGH https://access.redhat.com/security/cve/CVE-2026-4634
ssvc Track https://access.redhat.com/security/cve/CVE-2026-4634
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00067 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00072 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00072 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00072 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00072 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00072 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00088 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00088 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00088 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00088 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00088 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
epss 0.00088 https://api.first.org/data/v1/epss?cve=CVE-2026-4634
cvssv3.1 7.5 https://bugzilla.redhat.com/show_bug.cgi?id=2450250
generic_textual HIGH https://bugzilla.redhat.com/show_bug.cgi?id=2450250
ssvc Track https://bugzilla.redhat.com/show_bug.cgi?id=2450250
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-h4wv-g838-66g3
cvssv3.1 7.5 https://github.com/keycloak/keycloak
generic_textual HIGH https://github.com/keycloak/keycloak
cvssv3.1 7.5 https://github.com/keycloak/keycloak/commit/b455ee4f28abb6f2120aff72fd179589cc5267a0
generic_textual HIGH https://github.com/keycloak/keycloak/commit/b455ee4f28abb6f2120aff72fd179589cc5267a0
cvssv3.1 7.5 https://github.com/keycloak/keycloak/issues/47716
generic_textual HIGH https://github.com/keycloak/keycloak/issues/47716
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2026-4634
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-4634
Reference id Reference type URL
https://access.redhat.com/errata/RHSA-2026:6475
https://access.redhat.com/errata/RHSA-2026:6476
https://access.redhat.com/errata/RHSA-2026:6477
https://access.redhat.com/errata/RHSA-2026:6478
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-4634.json
https://api.first.org/data/v1/epss?cve=CVE-2026-4634
https://bugzilla.redhat.com/show_bug.cgi?id=2450250
https://github.com/keycloak/keycloak
https://github.com/keycloak/keycloak/commit/b455ee4f28abb6f2120aff72fd179589cc5267a0
https://github.com/keycloak/keycloak/issues/47716
cpe:/a:redhat:build_keycloak:26.2::el9 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:build_keycloak:26.2::el9
cpe:/a:redhat:build_keycloak:26.4::el9 https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:build_keycloak:26.4::el9
CVE-2026-4634 https://access.redhat.com/security/cve/CVE-2026-4634
CVE-2026-4634 https://nvd.nist.gov/vuln/detail/CVE-2026-4634
GHSA-h4wv-g838-66g3 https://github.com/advisories/GHSA-h4wv-g838-66g3
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/errata/RHSA-2026:6475
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-03T17:22:51Z/ Found at https://access.redhat.com/errata/RHSA-2026:6475
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/errata/RHSA-2026:6476
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-03T17:22:51Z/ Found at https://access.redhat.com/errata/RHSA-2026:6476
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/errata/RHSA-2026:6477
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-03T17:22:51Z/ Found at https://access.redhat.com/errata/RHSA-2026:6477
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/errata/RHSA-2026:6478
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-03T17:22:51Z/ Found at https://access.redhat.com/errata/RHSA-2026:6478
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-4634.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/security/cve/CVE-2026-4634
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-03T17:22:51Z/ Found at https://access.redhat.com/security/cve/CVE-2026-4634
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://bugzilla.redhat.com/show_bug.cgi?id=2450250
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-04-03T17:22:51Z/ Found at https://bugzilla.redhat.com/show_bug.cgi?id=2450250
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/keycloak/keycloak
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/keycloak/keycloak/commit/b455ee4f28abb6f2120aff72fd179589cc5267a0
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://github.com/keycloak/keycloak/issues/47716
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2026-4634
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.20807
EPSS Score 0.00067
Published At April 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-04T14:32:47.947348+00:00 GHSA Importer Import https://github.com/advisories/GHSA-h4wv-g838-66g3 38.1.0