RHSA-2025:18255
Vulnerability from csaf_redhat - Published: 2025-10-16 14:50 - Updated: 2026-04-20 17:46Summary
Red Hat Security Advisory: Red Hat build of Keycloak 26.0.16 Update
Severity
Important
Notes
Topic: New Red Hat build of Keycloak 26.0.16 packages are available from the Customer Portal
Details: Red Hat build of Keycloak 26.0.16 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications.
Security fixes:
* Keycloak TLS Client-Initiated Renegotiation Denial of Service (CVE-2025-11419)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in Keycloak. This vulnerability allows an unauthenticated remote attacker to cause a denial of service (DoS) by repeatedly initiating TLS 1.2 client-initiated renegotiation requests to exhaust server CPU resources, making the service unavailable.
7.5 (High)
Affected products
Fixed
7 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-operator-bundle@sha256:43a298583415c35ecbb5325283a9892566bd08fb0eb2ebd37e90610d88269649_amd64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:14b0fbc122f85168376a1769d591641fc2c8e93c0d0b771065cd3779b5ebc546_amd64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:3df0789cf7012777396528a72fd7c8af718bdf61e79ca3a5097ee77e37ade59d_ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:aef5994b152d534e81c9832b67cf6ff68e760d55915f830be02ac2bcaceae553_s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:42c1e459585e03df56aca5bbf83081d95f21b121f623fec4d36e9a42f697f945_s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:bbda28678bec5d9778a3f0da5bb2cb9becc971f6080eb03758316721720b83e8_amd64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:cfc457ab3d6cadd50622b18a1bf3967754545ba3cc435cd29ad4e80d592050e5_ppc64le | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
10 references
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{
"cve": "CVE-2025-11419",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2025-10-07T11:12:36.431000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2402142"
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],
"notes": [
{
"category": "description",
"text": "A flaw was found in Keycloak. This vulnerability allows an unauthenticated remote attacker to cause a denial of service (DoS) by repeatedly initiating TLS 1.2 client-initiated renegotiation requests to exhaust server CPU resources, making the service unavailable.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "keycloak: Keycloak TLS Client-Initiated Renegotiation Denial of Service",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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},
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"summary": "RHBZ#2402142",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402142"
},
{
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"summary": "https://www.cve.org/CVERecord?id=CVE-2025-11419",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-11419"
},
{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-11419"
},
{
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"url": "https://github.com/keycloak/keycloak/discussions/25209"
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"summary": "https://github.com/keycloak/keycloak/issues/43020",
"url": "https://github.com/keycloak/keycloak/issues/43020"
}
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"9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:3df0789cf7012777396528a72fd7c8af718bdf61e79ca3a5097ee77e37ade59d_ppc64le",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:aef5994b152d534e81c9832b67cf6ff68e760d55915f830be02ac2bcaceae553_s390x",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:42c1e459585e03df56aca5bbf83081d95f21b121f623fec4d36e9a42f697f945_s390x",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:bbda28678bec5d9778a3f0da5bb2cb9becc971f6080eb03758316721720b83e8_amd64",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:cfc457ab3d6cadd50622b18a1bf3967754545ba3cc435cd29ad4e80d592050e5_ppc64le"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2025:18255"
},
{
"category": "workaround",
"details": "To mitigate this vulnerability, configure Keycloak to reject client-initiated TLS renegotiation by adding the following Java system property to the Keycloak startup configuration:\n-Djdk.tls.rejectClientInitiatedRenegotiation=true\n\nThis prevents unauthenticated attackers from triggering repeated TLS renegotiations and exhausting server CPU resources.\nAdditionally, ensure that Keycloak is deployed behind proper network access controls and rate-limiting mechanisms to further reduce exposure to DoS attacks.",
"product_ids": [
"9Base-RHBK-26.0:rhbk/keycloak-operator-bundle@sha256:43a298583415c35ecbb5325283a9892566bd08fb0eb2ebd37e90610d88269649_amd64",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:14b0fbc122f85168376a1769d591641fc2c8e93c0d0b771065cd3779b5ebc546_amd64",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:3df0789cf7012777396528a72fd7c8af718bdf61e79ca3a5097ee77e37ade59d_ppc64le",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:aef5994b152d534e81c9832b67cf6ff68e760d55915f830be02ac2bcaceae553_s390x",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:42c1e459585e03df56aca5bbf83081d95f21b121f623fec4d36e9a42f697f945_s390x",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:bbda28678bec5d9778a3f0da5bb2cb9becc971f6080eb03758316721720b83e8_amd64",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:cfc457ab3d6cadd50622b18a1bf3967754545ba3cc435cd29ad4e80d592050e5_ppc64le"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"9Base-RHBK-26.0:rhbk/keycloak-operator-bundle@sha256:43a298583415c35ecbb5325283a9892566bd08fb0eb2ebd37e90610d88269649_amd64",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:14b0fbc122f85168376a1769d591641fc2c8e93c0d0b771065cd3779b5ebc546_amd64",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:3df0789cf7012777396528a72fd7c8af718bdf61e79ca3a5097ee77e37ade59d_ppc64le",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:aef5994b152d534e81c9832b67cf6ff68e760d55915f830be02ac2bcaceae553_s390x",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:42c1e459585e03df56aca5bbf83081d95f21b121f623fec4d36e9a42f697f945_s390x",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:bbda28678bec5d9778a3f0da5bb2cb9becc971f6080eb03758316721720b83e8_amd64",
"9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:cfc457ab3d6cadd50622b18a1bf3967754545ba3cc435cd29ad4e80d592050e5_ppc64le"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "keycloak: Keycloak TLS Client-Initiated Renegotiation Denial of Service"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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