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

Quick assessment

Affected
yawkat lz4-java
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LZ4 Java是Jonas Konrad个人开发者的一个Java的压缩库。 LZ4 Java 1.10.0及之前版本存在安全漏洞，该漏洞源于输出缓冲区清除不足，可能导致敏感数据泄露。

AI Predicted 7.5 Difficulty: Easy EPSS 0.61% · P47

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2025-66566

Vulnerability Information
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Vulnerability Title
yawkat LZ4 Java has a possible information leak in Java safe decompressor
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
LZ4 Java 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LZ4 Java是Jonas Konrad个人开发者的一个Java的压缩库。 LZ4 Java 1.10.0及之前版本存在安全漏洞，该漏洞源于输出缓冲区清除不足，可能导致敏感数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
yawkat lz4-java < 1.10.1 -

II. Public POCs for CVE-2025-66566

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III. Intelligence Information for CVE-2025-66566

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Patches & Fixes for CVE-2025-66566 (1)

Vendor Advisories for CVE-2025-66566 (1)

IV. Related Vulnerabilities

Same product: lz4-java
Same vendor: yawkat
Same weakness: CWE-201

V. Comments for CVE-2025-66566

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