RHSA-2026:21773
Vulnerability from csaf_redhat - Published: 2026-05-28 22:46 - Updated: 2026-05-29 09:03Summary
Red Hat Security Advisory: Red Hat Offline Knowledge Portal security and content update
Severity
Important
Notes
Topic: Red Hat Offline Knowledge Portal security fixes, bug fixes, enhancements & content update
Details: This Red Hat Offline Knowledge Portal release upgrades from Solr 9.8.1 to Solr 10.0.0, and fixes several CVEs. It also includes content updates as of May 26 2026.
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 org.eclipse.jetty. The Jetty URI parser handles invalid or unusual Uniform Resource Identifiers (URIs) differently compared to other common parsers. This discrepancy, known as differential parsing, can lead to security bypasses in systems that use multiple components to process URIs, such as when a blacklist enforcement component interprets a URI differently from a response generation component. At a minimum, this issue could unintentionally reveal internal system details.
CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')Affected products
Fixed
2 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64 | — |
Vendor Fix
fix
|
Threats
Impact
Low
A flaw was found in Eclipse Jetty. The HTTP/1.1 parser is vulnerable to request smuggling when chunk extensions are used. An attacker can inject crafted requests to manipulate and trick the parser. This issue can lead to security controls bypass, cache poisoning or unauthorized endpoint access.
7.4 (High)
Affected products
Fixed
2 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in Apache Log4j Core. A network-based attacker can perform a man-in-the-middle (MITM) attack, allowing them to intercept encrypted communications. This occurs when an SMTP, Socket, or Syslog appender uses Transport Layer Security (TLS) with a nested <Ssl> element, and the attacker has a certificate from a trusted Certificate Authority (CA). The vulnerability stems from an incomplete hostname verification fix, making TLS connections susceptible to interception.
6.8 (Medium)
Affected products
Fixed
2 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in Apache Log4j Core. This vulnerability allows for log injection through the use of Carriage Return Line Feed (CRLF) sequences. This occurs because security-related configuration attributes were silently renamed, impacting users who directly configure Rfc5424Layout with stream-based syslog services. An attacker could exploit this to inject malicious data into log files, potentially obscuring critical security events or manipulating system records.
5.8 (Medium)
Affected products
Fixed
2 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in the Apache Log4j 1-to-Log4j 2 bridge. The Log4j1XmlLayout component fails to properly escape characters forbidden by the XML 1.0 standard. This improper handling of characters results in malformed XML output, which can cause downstream log processing systems to drop or fail to index affected records. The primary consequence is a denial of service for log analysis, potentially hindering security monitoring and incident response.
5.3 (Medium)
Affected products
Fixed
2 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in Apache Log4j Core. The XmlLayout component, responsible for formatting log messages into XML, does not properly remove or replace characters that are not allowed in XML 1.0. When log messages or diagnostic information contain these forbidden characters, the resulting XML output becomes invalid. This can lead to two main issues: either systems processing these logs will fail to read the affected records, or the logging process itself will stop delivering events, both resulting in a denial of service for logging operations.
5.3 (Medium)
Affected products
Fixed
2 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in Apache Log4j's JsonTemplateLayout. This vulnerability allows a remote attacker to disrupt log processing systems. By sending log events that include specific non-numeric floating-point values, the attacker can cause the JsonTemplateLayout to generate invalid JSON output. This invalid output can then lead to downstream systems rejecting or failing to index these logs, effectively causing a denial of service for log analysis.
6.5 (Medium)
Affected products
Fixed
2 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
64 references
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"text": "This vulnerability is rated as Low by Red Hat. Successful usage of this vulnerability is non-trivial, as the attacker must be able to craft a URI that exploits Jetty\u0027s differential parsing while bypassing other parsers (ex. in a firewall or load balancer). Additionally, divulging implementation details is possible but not guaranteed while also being indirect, meaning that an attacker may be able to obtain error messages or behavioral differences, but those are not guaranteed. As such, there is likely no direct leak of sensitive data.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.7,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
},
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"threats": [
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"details": "Low"
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],
"title": "org.eclipse.jetty/jetty-http: org.eclipse.jetty: Security bypass due to differential URI parsing"
},
{
"cve": "CVE-2026-2332",
"cwe": {
"id": "CWE-444",
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"discovery_date": "2026-04-14T12:01:05.768902+00:00",
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"category": "workaround",
"details": "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.",
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"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64",
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]
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"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:L",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "org.apache.logging.log4j/log4j-1.2-api: Apache Log4j 1-to-Log4j 2 bridge: Log processing denial of service due to improper XML escaping"
},
{
"cve": "CVE-2026-34480",
"cwe": {
"id": "CWE-168",
"name": "Improper Handling of Inconsistent Special Elements"
},
"discovery_date": "2026-04-10T16:02:17.024798+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2457328"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Apache Log4j Core. The XmlLayout component, responsible for formatting log messages into XML, does not properly remove or replace characters that are not allowed in XML 1.0. When log messages or diagnostic information contain these forbidden characters, the resulting XML output becomes invalid. This can lead to two main issues: either systems processing these logs will fail to read the affected records, or the logging process itself will stop delivering events, both resulting in a denial of service for logging operations.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "org.apache.logging.log4j/log4j-core: Apache Log4j Core: Invalid XML output causes denial of service in logging",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw in Apache Log4j Core\u0027s XmlLayout component can lead to a denial of service in logging operations when log messages contain characters forbidden by the XML 1.0 specification. Systems processing these logs may fail to read records or the logging process may cease event delivery, impacting monitoring and auditing capabilities in affected Red Hat products. Red Hat products in their default configurations will be able to automatically recover, but some log messages may be lost.",
"title": "Statement"
},
{
"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"
}
],
"product_status": {
"fixed": [
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64",
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-34480"
},
{
"category": "external",
"summary": "RHBZ#2457328",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457328"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-34480",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34480"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34480",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34480"
},
{
"category": "external",
"summary": "https://github.com/apache/logging-log4j2/pull/4077",
"url": "https://github.com/apache/logging-log4j2/pull/4077"
},
{
"category": "external",
"summary": "https://lists.apache.org/thread/5x0hcnng0chhghp6jgjdp3qmbbhfjzhb",
"url": "https://lists.apache.org/thread/5x0hcnng0chhghp6jgjdp3qmbbhfjzhb"
},
{
"category": "external",
"summary": "https://logging.apache.org/cyclonedx/vdr.xml",
"url": "https://logging.apache.org/cyclonedx/vdr.xml"
},
{
"category": "external",
"summary": "https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout",
"url": "https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout"
},
{
"category": "external",
"summary": "https://logging.apache.org/security.html#CVE-2026-34480",
"url": "https://logging.apache.org/security.html#CVE-2026-34480"
}
],
"release_date": "2026-04-10T15:42:03.843000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-28T22:46:23+00:00",
"details": "The container image provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the \"podman pull\" command.",
"product_ids": [
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64",
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:21773"
},
{
"category": "workaround",
"details": "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.",
"product_ids": [
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64",
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"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:L",
"version": "3.1"
},
"products": [
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64",
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "org.apache.logging.log4j/log4j-core: Apache Log4j Core: Invalid XML output causes denial of service in logging"
},
{
"cve": "CVE-2026-34481",
"cwe": {
"id": "CWE-241",
"name": "Improper Handling of Unexpected Data Type"
},
"discovery_date": "2026-04-10T16:01:44.581898+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2457321"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Apache Log4j\u0027s JsonTemplateLayout. This vulnerability allows a remote attacker to disrupt log processing systems. By sending log events that include specific non-numeric floating-point values, the attacker can cause the JsonTemplateLayout to generate invalid JSON output. This invalid output can then lead to downstream systems rejecting or failing to index these logs, effectively causing a denial of service for log analysis.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "org.apache.logging.log4j: Apache Log4j JsonTemplateLayout: Denial of Service via invalid JSON output",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Exploitation of this flaw requires an application to be configured with JsonTemplateLayout and to log attacker-controlled non-finite floating-point values within a MapMessage, which is not a default or common configuration in Red Hat products.",
"title": "Statement"
},
{
"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"
}
],
"product_status": {
"fixed": [
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64",
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:ec8b14b7a170b689a19cee7820888e81ddc3affc2faada6cc6139644f328bd36_amd64"
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},
"references": [
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-34481"
},
{
"category": "external",
"summary": "RHBZ#2457321",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457321"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-34481",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34481"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34481",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34481"
},
{
"category": "external",
"summary": "https://github.com/apache/logging-log4j2/pull/4080",
"url": "https://github.com/apache/logging-log4j2/pull/4080"
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{
"category": "external",
"summary": "https://lists.apache.org/thread/n34zdv00gbkdbzt2rx9rf5mqz6lhopcv",
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"summary": "https://logging.apache.org/cyclonedx/vdr.xml",
"url": "https://logging.apache.org/cyclonedx/vdr.xml"
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{
"category": "external",
"summary": "https://logging.apache.org/log4j/2.x/manual/json-template-layout.html",
"url": "https://logging.apache.org/log4j/2.x/manual/json-template-layout.html"
},
{
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"url": "https://logging.apache.org/security.html#CVE-2026-34481"
}
],
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"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:21773"
},
{
"category": "workaround",
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"product_ids": [
"Red Hat Offline Knowledge Portal 1.2.4:registry.redhat.io/offline-knowledge-portal/rhokp-rhel9@sha256:b26253f0a6c6b9e8c8458ecb07e79e9f87ff313491fffc31e342e32bce0a2b3e_arm64",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
"version": "3.1"
},
"products": [
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "org.apache.logging.log4j: Apache Log4j JsonTemplateLayout: Denial of Service via invalid JSON output"
}
]
}
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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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