NULL pointer dereference in Yawkat Lz4-Java
CVE-2026-59949
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.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H.
Affected products
- Yawkat Lz4-java — versions < 1.11.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-59949?
- CVE-2026-59949 is a medium-severity vulnerability in Yawkat Lz4-Java, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-08-18.
- How severe is CVE-2026-59949?
- Medium severity. CVSS v3 base score is 6.5 out of 10.