CVE-2026-21945

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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). 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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)."}], "problemTypes": [{"descriptions": [{"lang": "en-US", "description": "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."}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:oracle:java_se:8u471:*:*:*:*:*:*:*", "vulnerable": true}, {"criteria": "cpe:2.3:a:oracle:java_se:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndIncluding": "b50", "versionStartIncluding": "8u471"}, {"criteria": "cpe:2.3:a:oracle:java_se:8u471:*:*:*:enterprise_performance:*:*:*", "vulnerable": true}, {"criteria": "cpe:2.3:a:oracle:java_se:11.0.29:*:*:*:*:*:*:*", "vulnerable": true}, {"criteria": "cpe:2.3:a:oracle:java_se:17.0.17:*:*:*:*:*:*:*", "vulnerable": true}, {"criteria": "cpe:2.3:a:oracle:java_se:21.0.9:*:*:*:*:*:*:*", "vulnerable": true}, {"criteria": "cpe:2.3:a:oracle:java_se:25.0.1:*:*:*:*:*:*:*", "vulnerable": true}, {"criteria": "cpe:2.3:a:oracle:graalvm_for_jdk:17.0.17:*:*:*:*:*:*:*", "vulnerable": true}, {"criteria": "cpe:2.3:a:oracle:graalvm_for_jdk:21.0.9:*:*:*:*:*:*:*", "vulnerable": true}, {"criteria": "cpe:2.3:a:oracle:graalvm:21.3.16:*:*:*:enterprise:*:*:*", "vulnerable": true}], "operator": "OR"}]}], "providerMetadata": {"orgId": "43595867-4340-4103-b7a2-9a5208d29a85", "shortName": "oracle", "dateUpdated": "2026-01-20T21:56:27.997Z"}}}, "cveMetadata": {"cveId": "CVE-2026-21945", "state": "PUBLISHED", "dateUpdated": "2026-07-31T12:04:46.050Z", "dateReserved": "2026-01-05T18:07:34.712Z", "assignerOrgId": "43595867-4340-4103-b7a2-9a5208d29a85", "datePublished": "2026-01-20T21:56:27.997Z", "assignerShortName": "oracle"}, "dataVersion": "5.2"}

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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)."}, {"lang": "es", "value": "Vulnerabilidad en el producto Oracle Java SE, Oracle GraalVM para JDK, Oracle GraalVM Enterprise Edition de Oracle Java SE (componente: Seguridad). Las versiones compatibles afectadas son Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM para JDK: 17.0.17 y 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. La vulnerabilidad f\u00e1cilmente explotable permite a un atacante no autenticado con acceso a la red a trav\u00e9s de m\u00faltiples protocolos comprometer Oracle Java SE, Oracle GraalVM para JDK, Oracle GraalVM Enterprise Edition. Los ataques exitosos de esta vulnerabilidad pueden resultar en la capacidad no autorizada de causar un bloqueo o una ca\u00edda (crash) frecuentemente repetible (DoS completo) de Oracle Java SE, Oracle GraalVM para JDK, Oracle GraalVM Enterprise Edition. Nota: Esta vulnerabilidad se aplica a implementaciones de Java, t\u00edpicamente en clientes que ejecutan aplicaciones Java Web Start en sandbox o applets Java en sandbox, que cargan y ejecutan c\u00f3digo no confiable (por ejemplo, c\u00f3digo que proviene de internet) y dependen del sandbox de Java para la seguridad. Esta vulnerabilidad no se aplica a implementaciones de Java, t\u00edpicamente en servidores, que cargan y ejecutan solo c\u00f3digo confiable (por ejemplo, c\u00f3digo instalado por un administrador). Puntuaci\u00f3n base CVSS 3.1 7.5 (Impactos en la disponibilidad). Vector CVSS: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)."}], "id": "CVE-2026-21945", "lastModified": "2026-07-15T02:18:32.323", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "secalert_us@oracle.com", "type": "Secondary"}, {"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21945", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-21T15:04:39.899042Z", "version": "2.0.3"}}]}, "published": "2026-01-20T22:15:57.390", "references": [{"source": "secalert_us@oracle.com", "tags": ["Vendor Advisory"], "url": "https://www.oracle.com/security-alerts/cpujan2026.html"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0847"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0848"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0895"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0897"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0899"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0901"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0927"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0928"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0931"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0932"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:0933"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:1606"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:4832"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-21945"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429927"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21945.json"}], "sourceIdentifier": "secalert_us@oracle.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-295"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2026:0848", "cpe": "cpe:/a:redhat:openjdk_els:11", "package": "java-11-openjdk-portable", "product_name": "OPENJDK ELS 11.0.30", "release_date": "2026-01-21T00:00:00Z"}, {"advisory": "RHSA-2026:0849", "cpe": "cpe:/a:redhat:openjdk_els:11", "package": "java-11-openjdk-windows", "product_name": "OPENJDK ELS 11.0.30", "release_date": "2026-01-21T00:00:00Z"}, {"advisory": "RHSA-2026:0847", "cpe": "cpe:/a:redhat:openjdk_els:11::el7", "package": "java-11-openjdk-1:11.0.30.0.7-1.el7_9", "product_name": "Red Hat OpenJDK 11 els for RHEL 7", "release_date": "2026-01-21T00:00:00Z"}, {"advisory": "RHSA-2026:0847", "cpe": "cpe:/a:redhat:openjdk_els:11::el8", "package": "java-11-openjdk-1:11.0.30.0.7-1.el8", "product_name": "Red Hat OpenJDK 11 els for RHEL 8", "release_date": "2026-01-21T00:00:00Z"}, {"advisory": "RHSA-2026:0847", "cpe": "cpe:/a:redhat:openjdk_els:11::el9", "package": "java-11-openjdk-1:11.0.30.0.7-1.el9", "product_name": "Red Hat OpenJDK 11 els for RHEL 9", "release_date": "2026-01-21T00:00:00Z"}], "bugzilla": {"description": "openjdk: Enhance Certificate Checking (Oracle CPU 2026-01)", "id": "2429927", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429927"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-295", "details": ["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)."], "name": "CVE-2026-21945", "package_state": [{"cpe": "cpe:/a:redhat:openjdk:17", "fix_state": "Affected", "package_name": "java-17-openjdk-portable", "product_name": "Red Hat build of OpenJDK 17"}, {"cpe": "cpe:/a:redhat:openjdk:17", "fix_state": "Affected", "package_name": "java-17-openjdk-windows", "product_name": "Red Hat build of OpenJDK 17"}, {"cpe": "cpe:/a:redhat:openjdk:1.8", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk-portable", "product_name": "Red Hat build of OpenJDK 1.8"}, {"cpe": "cpe:/a:redhat:openjdk:1.8", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk-windows", "product_name": "Red Hat build of OpenJDK 1.8"}, {"cpe": "cpe:/a:redhat:openjdk:21", "fix_state": "Affected", "package_name": "java-21-openjdk-portable", "product_name": "Red Hat build of OpenJDK 21"}, {"cpe": "cpe:/a:redhat:openjdk:21", "fix_state": "Affected", "package_name": "java-21-openjdk-windows", "product_name": "Red Hat build of OpenJDK 21"}, {"cpe": "cpe:/a:redhat:openjdk:25", "fix_state": "Affected", "package_name": "java-25-openjdk-portable", "product_name": "Red Hat build of OpenJDK 25"}, {"cpe": "cpe:/a:redhat:openjdk:25", "fix_state": "Affected", "package_name": "java-25-openjdk-windows", "product_name": "Red Hat build of OpenJDK 25"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "java-21-ibm-semeru-certified-jdk", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "java-25-openjdk", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "java-1.6.0-openjdk", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "java-1.7.0-openjdk", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "java-1.8.0-openjdk", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "java-1.6.0-openjdk", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "java-1.7.0-openjdk", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "java-17-openjdk", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "java-1.8.0-ibm", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-17-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-1.8.0-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-21-openjdk", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "java-25-openjdk", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-20T21:21:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-21945\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-21945"], "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-18T19:55:22.716638+00:00", "value": {"mitigation_remediation": ["Upgrade Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition to a version that is not explicitly listed as affected in the CVE data.", "Disable or restrict Java Web Start and sandboxed applet execution, or limit network access to trusted sources to prevent loading untrusted code.", "If Red\u202fHat OpenJDK ELS\u202f11 is in use, ensure it is updated to a non\u2011affected release that addresses the same underlying issue."], "summary": {"action": "Patch Immediately", "impact": "Denial of Service (application hang or crash)"}, "threat_synthesis": {"affected_systems": "Affected versions 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; and Oracle GraalVM Enterprise Edition 21.3.16. The list of CPEs also references Red\u202fHat OpenJDK ELS\u202f11, suggesting that equivalent OpenJDK distributions that share the same code base may be impacted.", "description_and_impact": "The vulnerability arises when Oracle Java SE, Oracle GraalVM for JDK and Oracle GraalVM Enterprise Edition validate certificates in a sandboxed environment. It allows an unauthenticated attacker with network access to cause a forced hang or complete crash when the Java runtime loads untrusted code. The flaw does not lead to data compromise or privilege escalation; it solely impacts availability.", "risk_and_exploitability": "The CVSS v3.1 score of 7.5 reflects a high availability impact with low attack complexity. Network based, unauthenticated exploitation is sufficient, and the EPSS score of less than 1\u202f% indicates that, while the probability of exploitation is low, it remains possible. The vulnerability is not flagged in the CISA KEV catalog. Attackers can trigger the flaw over multiple protocols, exposing client\u2011side Java deployments that rely on the sandbox to potential downtime without needing privileged access or authentication."}}}}, "created": "2026-04-18T20:00:09.299123+00:00", "updated": "2026-04-18T20:00:09.299145+00:00", "vendors": []}