CVE-2026-70906 in Java SE
Summary
by MITRE • 08/19/2026
Vulnerability in Oracle Java SE (component: 2D). Supported versions that are affected are Oracle Java SE: 25.0.4 and 26.0.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Java SE. 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 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).
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Analysis
by VulDB Data Team • 08/20/2026
The identified vulnerability resides within the Java SE 2D component of Oracle Java Standard Edition, specifically affecting versions 25.0.4 and 26.0.2. This security flaw is classified as a high-severity availability issue with a CVSS v3.1 base score of 7.5. The core technical nature of the vulnerability involves an easily exploitable condition that allows unauthenticated attackers to trigger a complete denial of service against the Java runtime environment. Unlike vulnerabilities that compromise confidentiality or integrity, this flaw is strictly focused on disrupting operational continuity by causing the application to hang or crash repeatedly. The attack vector requires network access via multiple protocols and does not necessitate any form of user interaction or authentication credentials, making it particularly dangerous in environments where untrusted code execution is a standard operational model.
From an architectural perspective, this vulnerability impacts Java deployments that rely on sandboxing for security isolation, such as clients running sandboxed Java Web Start applications or sandboxed Java applets. These deployment models are designed to execute untrusted code from the internet within a restricted environment. However, when the 2D component processes specific data inputs supplied through APIs, potentially via web services, it fails to handle certain conditions correctly, leading to resource exhaustion or infinite loops that result in system hangs or crashes. This behavior aligns with Common Weakness Enumeration categories related to improper input validation and handling of exceptional states during rendering operations. The ability for an attacker to trigger these failures remotely without interaction significantly lowers the barrier for exploitation compared to vulnerabilities requiring user clicks or file uploads.
The operational impact of this vulnerability is severe due to its direct effect on service availability. A successful exploit results in a complete denial of service, meaning that any system running the affected Java versions and processing maliciously crafted 2D graphics data will become unresponsive or terminate unexpectedly. In enterprise environments where Java applets or Web Start applications are used for critical business processes, this can lead to significant downtime and loss of productivity. Furthermore, because the vulnerability affects the core rendering engine, it may also impact performance stability even if a full crash is not immediately triggered, potentially leading to degraded user experience and increased resource consumption on affected hosts.
Mitigation strategies must prioritize immediate patching or upgrading Oracle Java SE to versions that address this specific flaw in the 2D component. Organizations relying on legacy systems that cannot be upgraded should consider implementing network-level controls such as web application firewalls or deep packet inspection solutions capable of detecting and blocking malformed graphics data packets associated with this exploit vector. Additionally, reviewing deployment configurations to minimize reliance on sandboxed applets and Web Start applications can reduce the attack surface. Security teams should also monitor for indicators of compromise related to unusual spikes in CPU usage or memory consumption within Java processes, which may indicate ongoing exploitation attempts targeting this availability weakness.