CVE-2025-66566

EUVD-2025-201456

05.12.2025, 18:15

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
GitHub_M	CNA	8.2 HIGH	NETWORK	LOW	NONE	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

Base Score

CVSS 3.x

EPSS Score

Percentile: 20%

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
yawkat	lz4_java	𝑥 < 1.10.1	CNA

Debian Releases

Debian Product

Codename

lz4-java

bookworm	no-dsa
bullseye	no-dsa
forky	vulnerable
sid	vulnerable
trixie	no-dsa

Red Hat Enterprise Linux Releases

Red Hat Product

Release

jmc

RHEL 9

0:8.2.0-19.el9_8.2

fixed

Common Weakness Enumeration

CWE-201 - Insertion of Sensitive Information Into Sent Data
The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor.

References

https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840

https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q