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CVE-2026-59949— yawkat LZ4 Java: JVM Crash via Null Byte Array in lz4-java Streaming XXHash JNI (StreamingXXHash32JNI / StreamingXXHash64JNI)

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.

yawkat LZ4 Java 为 Java 提供了 LZ4 压缩功能。在 1.11.1 版本之前，基于 JNI 的 XXHash 实现在调用 、 、 和 时，未能对字节数组对象以及偏移量（off）和长度（len）参数进行有效性验证。这可能导致传入空数组或超出范围的长度参数，进而使本地代码访问 Java 数组边界之外的内存，最终导致 JVM 致命终止。该问题已在 1.11.1 版本中修复。

CVSS 6.5 · Medium EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
yawkat lz4-java < 1.11.1 affected
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I. Basic Information for CVE-2026-59949

Vulnerability Information
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Vulnerability Title
yawkat LZ4 Java: JVM Crash via Null Byte Array in lz4-java Streaming XXHash JNI (StreamingXXHash32JNI / StreamingXXHash64JNI)
Source: CVE Program / CVE List V5
Vulnerability Description
yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.1, JNI-backed XXHash implementations fail to validate the byte array object and the off and len arguments in XXHashFactory.nativeInstance().hash32().hash(), XXHashFactory.nativeInstance().hash64().hash(), XXHashFactory.nativeInstance().newStreamingHash32().update(), and XXHashFactory.nativeInstance().newStreamingHash64().update(), allowing null arrays or oversized ranges to reach native code, read outside the Java array, and fatally terminate the JVM. This issue is fixed in version 1.11.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
yawkat lz4-java < 1.11.1 -

II. Public POCs for CVE-2026-59949

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III. Intelligence Information for CVE-2026-59949

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Patches & Fixes for CVE-2026-59949 (1)

Vendor Advisories for CVE-2026-59949 (1)

Vendor Pages for CVE-2026-59949 (1)

IV. Related Vulnerabilities

Same product: lz4-java
Same vendor: yawkat
Same weakness: CWE-476

V. Comments for CVE-2026-59949

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