CVE-2025-66566 HIGH

CVE-2025-66566: yawkat LZ4 Java has a possible information leak in Java safe decompressor

Vendor Yawkat
Product lz4-java
Weakness CWE-201
Published December 5, 2025
Last update December 5, 2025

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

Description

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.

Key dates

Disclosure timeline

December 5, 2025 CVE published
December 5, 2025 Record updated