---
id: CVE-2025-66566
title: yawkat LZ4 Java provides LZ4 compression for Java
summary: >-
  yawkat LZ4 Java provides LZ4 compression for Java. Insufficient clearing of
  the output buffer in Java-based decompressor implementations in lz4-java
  1.10.0 and earlier allows remote attackers to read previous buffer contents
  via crafted …
severity: none
cwe:
  - CWE-201
published: '2025-12-05'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T23:10:00.463'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66566'
references:
  - url: >-
      https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840
    label: security-advisories@github.com
  - url: 'https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00605
epssPercentile: 0.46728
ingestedAt: '2026-09-25T23:21:16.898Z'
---

## Overview

yawkat LZ4 Java provides LZ4 compression for Java. Insufficient clearing of the output buffer in Java-based decompressor implementations in lz4-java 1.10.0 and earlier allows remote attackers to read previous buffer contents via crafted compressed input. In applications where the output buffer is reused without being cleared, this may lead to disclosure of sensitive data. JNI-based implementations are not affected. This vulnerability is fixed in 1.10.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.