#VU121007 Information disclosure in lz4-java - CVE-2025-66566
Published: January 7, 2026
Vulnerability identifier: #VU121007
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-66566
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
lz4-java
lz4-java
Software vendor:
jpountz (Adrien Grand)
jpountz (Adrien Grand)
Description
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the application insufficiently clears the output buffer in Java-based decompressor implementations. In applications where the output buffer is reused without being cleared, this may lead to disclosure of sensitive data.
Note, JNI-based implementations are not affected.
Remediation
Install updates from vendor's website.