CVE-2026-16439
Received Received - Intake

Buffer Underflow in Eclipse OpenJ9 via -Xtrace

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: Eclipse Foundation

Description
In Eclipse OpenJ9 versions up to 0.60, using -Xtrace to trace method arguments can lead to buffer underflow.

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Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-21
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-16439
EUVD
EUVD-2026-46338

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
eclipse openj9 to 0.60 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-124 The product writes to a buffer using an index or pointer that references a memory location prior to the beginning of the buffer.

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Executive Summary

This vulnerability in Eclipse OpenJ9 versions up to 0.60 occurs when using the -Xtrace option to trace method arguments. It can cause a buffer underflow, where a null value is incorrectly written just before the start of an allocated memory buffer. This leads to memory corruption due to improper handling in the traceMethodArguments implementation.

Detection Guidance

To detect this vulnerability, check if your Eclipse OpenJ9 version is below 0.60.0. Run the command: java -version and verify the version. If using -Xtrace for method arguments, monitor for crashes or memory corruption.

Impact Analysis

The vulnerability may cause memory corruption, potentially leading to crashes, data corruption, or unexpected behavior in applications using affected OpenJ9 versions. Attackers could exploit this to disrupt services or gain unauthorized access if the memory corruption affects security-sensitive operations.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR or HIPAA as it involves a memory corruption issue in the Eclipse OpenJ9 tracing mechanism. However, if exploited, it could lead to undefined behavior or crashes in applications handling sensitive data, potentially impacting data integrity or availability.

Mitigation Strategies

Upgrade Eclipse OpenJ9 to version 0.60.0 or later. If upgrading is not possible, avoid using the -Xtrace option with method arguments to prevent buffer underflow issues.

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