CVE-2026-61308

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Heap Overflow in Oracle Java SE

Publication date: 2026-08-18

Last updated on: 2026-08-21

Assigner: Oracle

Description

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: 8u501, 11.0.32, 17.0.20, 21.0.12, 25.0.4, 26.0.2; Oracle GraalVM for JDK: 17.0.20 and 21.0.12; Oracle GraalVM Enterprise Edition: 21.3.19. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. 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 access to critical data or complete access to all 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 6.8 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N).

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-18

Last Modified

2026-08-21

Generated

2026-09-08

AI Q&A

2026-08-19

EPSS Evaluated

2026-09-06

NVD

CVE-2026-61308

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	java_se	8u501
oracle	java_se	11.0.32
oracle	java_se	17.0.20
oracle	java_se	21.0.12
oracle	java_se	25.0.4
oracle	java_se	26.0.2
oracle	graalvm_for_jdk	17.0.20
oracle	graalvm_for_jdk	21.0.12
oracle	graalvm_enterprise_edition	21.3.19

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition affecting specific versions. It allows an unauthenticated attacker with network access via HTTP to potentially compromise these products and access critical data. The attack is difficult to exploit but could lead to unauthorized access to sensitive information.

Detection Guidance

This vulnerability is related to Oracle Java SE networking components and requires checking installed Java versions and configurations. Use commands like 'java -version' to verify installed versions and 'netstat -tuln' to inspect network connections. Ensure affected versions (8u501, 11.0.32, 17.0.20, 21.0.12, 25.0.4, 26.0.2) are updated or patched.

Impact Analysis

If you use affected versions of Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition, an attacker could exploit this to gain unauthorized access to critical data stored or processed by these products. This includes data accessible through APIs or web services using the vulnerable component.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations using affected versions must address this to maintain data protection and regulatory compliance.

Mitigation Strategies

Update affected Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition versions to the latest patched releases immediately. Disable unnecessary network services or APIs that interact with the vulnerable component. Restrict network access to Java applications via firewalls or network segmentation.

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