CVE-2025-66566

lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing

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Severity

Important

Red Hat Product Security

7.5

CVSS 3.1

Review impact separately from score.

Published · December 6, 2025

Updated · October 20, 2026

Description

A flaw was found in lz4-java. This vulnerability allows disclosure of sensitive data via crafted compressed input due to insufficient clearing of the output buffer in Java-based decompressor implementations.

Statement

This vulnerability is rated IMPORTANT because it allows for information disclosure when Java-based decompressor implementations reuse output buffers without proper clearing, potentially exposing sensitive data via crafted compressed input. JNI-based implementations of lz4-java are not affected by this issue.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CWE-908 · Use of Uninitialized Resource