RHSA-2026:0849
Vulnerability from csaf_redhat - Published: 2026-01-21 13:47 - Updated: 2026-10-30 03:27Summary
Red Hat Security Advisory: OpenJDK 11.0.30 ELS Security Update for Windows Builds
Severity
Moderate
Notes
Topic: An update is now available for OpenJDK.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The OpenJDK 11 packages provide the OpenJDK 11 Java Runtime Environment and the OpenJDK 11 Java Software Development Kit.
This release of the Red Hat build of OpenJDK 11 (11.0.30) with Extended Lifecycle Support for Windows serves as a replacement for the Red Hat build of OpenJDK 11 (11.0.29) and includes security and bug fixes as well as enhancements. For further information, refer to the release notes linked to in the References section.
Security Fix(es):
* JDK: Improve JMX connections (CVE-2026-21925)
* JDK: Enhance Handling of URIs (CVE-2026-21932)
* JDK: Improve HttpServer Request handling (CVE-2026-21933)
* JDK: Enhance Certificate Checking (CVE-2026-21945)
* JDK: LIBPNG heap buffer overflow (CVE-2025-65018)
* JDK: LIBPNG buffer overflow (CVE-2025-64720)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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 buffer overflow flaw has been discovered in libpng. An out-of-bounds read vulnerability exists in png_image_read_composite when processing palette images with PNG_FLAG_OPTIMIZE_ALPHA enabled. The palette compositing code in png_init_read_transformations incorrectly applies background compositing during premultiplication, violating the invariant component ≤ alpha × 257 required by the simplified PNG API.
7.1 (High)
Affected products
Fixed
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
OPENJDK ELS 11.0.30
Red Hat / Red Hat OpenJDK
|
cpe:/a:redhat:openjdk_els:11
|
— |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A buffer overflow flaw has been discovered in libpng. There is a heap buffer overflow vulnerability in the libpng simplified API function png_image_finish_read when processing 16-bit interlaced PNGs with 8-bit output format. Attacker-crafted interlaced PNG files cause heap writes beyond allocated buffer bounds.
7.1 (High)
Affected products
Fixed
1 product, the same list as for
CVE-2025-64720
Threats
Impact
Important
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: RMI). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as unauthorized read access to a subset of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).
4.8 (Medium)
Affected products
Fixed
1 product, the same list as for
CVE-2025-64720
Threats
Impact
Moderate
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: AWT, JavaFX). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 7.4 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N).
7.4 (High)
Affected products
Fixed
1 product, the same list as for
CVE-2025-64720
Threats
Impact
Important
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as unauthorized read access to a subset of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 6.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).
6.1 (Medium)
Affected products
Fixed
1 product, the same list as for
CVE-2025-64720
Threats
Impact
Moderate
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Security). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
7.5 (High)
Affected products
Fixed
1 product, the same list as for
CVE-2025-64720
Threats
Impact
Important
References
43 references
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{
"category": "description",
"text": "Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: RMI). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as unauthorized read access to a subset of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openjdk: Improve JMX connections (Oracle CPU 2026-01)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as Moderate severity for Red Hat because exploitation requires an attacker to occupy an active man-in-the-middle network position, limiting the attack surface to scenarios where network traffic can be intercepted. Java deployments utilizing OpenJDK for Remote Method Invocation (RMI) or JMX communication over encrypted channels are affected when interacting across untrusted networks without server identity verification. Because the flaw only compromises transmitted session data and does not grant direct arbitrary code execution or system-level access, the overall impact is limited to partial loss of confidentiality and integrity.",
"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": [
"OPENJDK ELS 11.0.30"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-21925"
},
{
"category": "external",
"summary": "RHBZ#2429924",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429924"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-21925",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-21925"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-21925",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21925"
},
{
"category": "external",
"summary": "https://www.oracle.com/security-alerts/cpujan2026.html#AppendixJAVA",
"url": "https://www.oracle.com/security-alerts/cpujan2026.html#AppendixJAVA"
}
],
"release_date": "2026-01-20T21:21:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-01-21T13:47:54+00:00",
"details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
"OPENJDK ELS 11.0.30"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:0849"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"products": [
"OPENJDK ELS 11.0.30"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "openjdk: Improve JMX connections (Oracle CPU 2026-01)"
},
{
"cve": "CVE-2026-21932",
"cwe": {
"id": "CWE-1287",
"name": "Improper Validation of Specified Type of Input"
},
"discovery_date": "2026-01-15T12:01:50.512000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2429925"
}
],
"notes": [
{
"category": "description",
"text": "Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: AWT, JavaFX). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 7.4 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openjdk: Enhance Handling of URIs (Oracle CPU 2026-01)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Red Hat has rated this vulnerability as Important severity because supplying untrusted URI targets to the desktop browsing handler can result in arbitrary executable invocation across system boundaries, potentially compromising host integrity. This flaw specifically affects Windows releases of the Red Hat Build of OpenJDK, whereas OpenJDK packages on Red Hat Enterprise Linux do not contain the affected code. Typical server deployments that do not invoke desktop graphical interfaces or handle untrusted URI browsing remain unexposed.",
"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": [
"OPENJDK ELS 11.0.30"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-21932"
},
{
"category": "external",
"summary": "RHBZ#2429925",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429925"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-21932",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-21932"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-21932",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21932"
},
{
"category": "external",
"summary": "https://www.oracle.com/security-alerts/cpujan2026.html#AppendixJAVA",
"url": "https://www.oracle.com/security-alerts/cpujan2026.html#AppendixJAVA"
}
],
"release_date": "2026-01-20T21:21:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-01-21T13:47:54+00:00",
"details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
"OPENJDK ELS 11.0.30"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:0849"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
"OPENJDK ELS 11.0.30"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "openjdk: Enhance Handling of URIs (Oracle CPU 2026-01)"
},
{
"cve": "CVE-2026-21933",
"cwe": {
"id": "CWE-93",
"name": "Improper Neutralization of CRLF Sequences (\u0027CRLF Injection\u0027)"
},
"discovery_date": "2026-01-15T12:03:57.932000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2429926"
}
],
"notes": [
{
"category": "description",
"text": "Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks require human interaction from a person other than the attacker and while the vulnerability is in Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as unauthorized read access to a subset of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 6.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openjdk: Improve HttpServer Request handling (Oracle CPU 2026-01)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as Moderate impact because exploiting it requires an application to actively implement OpenJDK\u0027s built-in HTTP server to handle untrusted input, and successful exploitation necessitates user interaction to trigger response manipulation or cross-site scripting rather than enabling direct remote code execution. In typical Red Hat Enterprise Linux deployments, enterprise applications rely on standalone web servers or robust servlet containers rather than the lightweight embedded HTTP server provided by the JDK. Systems are only exposed if custom or third-party Java services directly expose this internal server component to untrusted network traffic.",
"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": [
"OPENJDK ELS 11.0.30"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-21933"
},
{
"category": "external",
"summary": "RHBZ#2429926",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429926"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-21933",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-21933"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-21933",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21933"
},
{
"category": "external",
"summary": "https://www.oracle.com/security-alerts/cpujan2026.html#AppendixJAVA",
"url": "https://www.oracle.com/security-alerts/cpujan2026.html#AppendixJAVA"
}
],
"release_date": "2026-01-20T21:21:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-01-21T13:47:54+00:00",
"details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
"OPENJDK ELS 11.0.30"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:0849"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
},
"products": [
"OPENJDK ELS 11.0.30"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "openjdk: Improve HttpServer Request handling (Oracle CPU 2026-01)"
},
{
"cve": "CVE-2026-21945",
"cwe": {
"id": "CWE-295",
"name": "Improper Certificate Validation"
},
"discovery_date": "2026-01-15T12:05:58.026000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2429927"
}
],
"notes": [
{
"category": "description",
"text": "Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Security). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Note: This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openjdk: Enhance Certificate Checking (Oracle CPU 2026-01)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated as an Important impact because an unauthenticated remote attacker can trigger a denial of service through an application hang or crash when Authority Information Access (AIA) is enabled. In standard Red Hat Enterprise Linux and OpenJDK environments, automatic retrieval of intermediate certificates via AIA is disabled by default, significantly limiting exposure on typical systems. Impact is restricted to environments that explicitly activate AIA caIssuers fetching to validate untrusted peer certificates.",
"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": [
"OPENJDK ELS 11.0.30"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-21945"
},
{
"category": "external",
"summary": "RHBZ#2429927",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429927"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-21945",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-21945"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-21945",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-21945"
},
{
"category": "external",
"summary": "https://www.oracle.com/security-alerts/cpujan2026.html#AppendixJAVA",
"url": "https://www.oracle.com/security-alerts/cpujan2026.html#AppendixJAVA"
}
],
"release_date": "2026-01-20T21:21:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-01-21T13:47:54+00:00",
"details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
"OPENJDK ELS 11.0.30"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:0849"
}
],
"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": [
"OPENJDK ELS 11.0.30"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "openjdk: Enhance Certificate Checking (Oracle CPU 2026-01)"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.