CVE-2026-83357 in GraalVM for JDK
Summary
by MITRE • 09/16/2026
Vulnerability in the Oracle GraalVM for JDK, Oracle GraalVM product of Oracle Java SE (component: Compiler). The supported version that is affected is Oracle GraalVM for JDK 17: 23.0.13.1; Oracle GraalVM for JDK 21: 23.1.12.1; Oracle GraalVM: 25.0.4.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle GraalVM for JDK, Oracle GraalVM. Successful attacks of this vulnerability can result in takeover of Oracle GraalVM for JDK, Oracle GraalVM. CVSS 3.1 Base Score 8.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).
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Analysis
by VulDB Data Team • 09/16/2026
The identified vulnerability resides within the Compiler component of Oracle GraalVM for JDK and Oracle GraalVM, specifically affecting versions 23.0.13.1 for JDK 17, 23.1.12.1 for JDK 21, and version 25.0.4.1 of Oracle GraalVM itself. This flaw is classified as a critical security issue due to its potential impact on the confidentiality, integrity, and availability of the Java runtime environment. The Common Vulnerability Scoring System version 3.1 assigns this vulnerability a base score of 8.1, indicating a high severity level that warrants immediate attention from system administrators and developers relying on these specific versions for production workloads.
From a technical perspective, the core issue stems from an error in how the GraalVM compiler processes certain inputs during the compilation phase. Although the description notes it is difficult to exploit, this difficulty typically refers to the complexity of crafting the precise malicious input required to trigger the flaw rather than network-based access barriers. The vulnerability allows for unauthorized code execution or state manipulation within the JVM process because the compiler fails to properly validate or sanitize specific constructs before generating native code or bytecode optimizations. This lack of rigorous boundary checking enables an attacker who can influence the compilation context, potentially through HTTP requests if the GraalVM is exposed via a web service or JIT compilation endpoint, to inject malicious logic that bypasses standard security controls.
The operational impact of this vulnerability is severe, as successful exploitation leads to complete takeover of the Oracle GraalVM process. This means an unauthenticated attacker with network access can achieve arbitrary code execution within the context of the Java application running on GraalVM. Such a compromise allows for full control over the underlying operating system if the JVM runs with elevated privileges, leading to data exfiltration, modification of critical business logic, or destruction of services. The attack vector is classified as Network (AV:N) and requires no Authentication (PR:N), which significantly increases the risk surface by allowing remote attackers to target vulnerable systems without prior credentials. However, the Attack Complexity is listed as High (AC:H), suggesting that successful exploitation may require specific conditions or sophisticated payload construction that might not be easily automated in all scenarios.
In terms of industry standard classifications, this vulnerability aligns with CWE-94 Improper Control of Generation of Code ('Code Injection') and potentially CWE-20 Improper Input Validation depending on the exact mechanism of failure within the compiler pipeline. From a tactical perspective, it maps to MITRE ATT&CK techniques related to Initial Access via Network Service Execution and subsequent Privilege Escalation if the JVM process has broader system permissions. The high availability impact (A:H) also suggests potential for Denial of Service conditions where malformed inputs could crash the JIT compiler or the entire runtime environment, disrupting service continuity.
Mitigation strategies must focus on immediate version updates and architectural hardening. Organizations should upgrade to a patched version of Oracle GraalVM that addresses this specific compiler flaw as soon as possible. If upgrading is not immediately feasible, implementing strict network segmentation to limit HTTP access to systems running the vulnerable versions can reduce exposure. Additionally, deploying Web Application Firewalls with rules designed to detect anomalous compilation requests or excessive resource consumption during JIT operations may help mitigate exploitation attempts. It is also critical to ensure that Java applications run under least-privilege principles, minimizing the potential damage if a compromise occurs by restricting file system and network permissions available to the JVM process. Regular security audits of GraalVM configurations and continuous monitoring for unusual compilation patterns are recommended to detect any attempted exploitation activities early in the kill chain.