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Fencer Vulns
medium 6.5

CVE-2026-59949 json

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

published 2026-07-24 3 mo ago modified 2026-10-22 17 d ago also GHSA-xx22-p4ch-683r , EUVD-2026-60947

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

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.

Patch / fix

  • maven at.yawk.lz4:lz4-java 1.11.1
  • lz4-java Debian 14 1.11.2+ds1-1

debian advisories DEBIAN-CVE-2026-59949

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-59949 updated

lz4-java: lz4-java: Denial of Service via insufficient validation in XXHash JNI implementations

  • Red Hat OpenShift Developer Tools and Services jenkins-2-plugins, ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9 Red Hat build of Apache Camel 4 for Quarkus 3 lz4-java Red Hat build of Apache Camel for Spring Boot 4 lz4-java, liblz4-java.so Red Hat build of Apicurio Registry 3 lz4-java Red Hat build of Debezium 3 lz4-java Red Hat Enterprise Linux 8 lz4-java, lz4-java-javadoc
    +6 more products
    Red Hat Enterprise Linux 9 jmc Red Hat Fuse 7 lz4-java Red Hat Hardened Images maven3.9 Red Hat JBoss Enterprise Application Platform 8 lz4-java, liblz4-java.so Red Hat JBoss Enterprise Application Platform Expansion Pack lz4-java, liblz4-java.so Red Hat OpenShift AI (RHOAI) rhoai/odh-spark-operator-rhel9, rhoai/odh-th-torch-cpu-py312-rhel9, rhoai/odh-th-torch-cuda-py312-rhel9, rhoai/odh-th06-cpu-torch210-py312-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-rocm64-torch291-py312-rhel9, +2 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Quarkus 3.27.6.redhat lz4-java 1.11.1.rhel8-redhat-00001
    fixed: vendor fix RHSA-2026:83082
  • Red Hat build of Quarkus 3.33.4.redhat lz4-java 1.11.1.rhel8-redhat-00001
    fixed: vendor fix RHSA-2026:83520
  • Red Hat build of Quarkus 3.27.6.redhat jna 5.8.0, db2 1.21.4, h2 2.3.230, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, +1009 more Red Hat build of Quarkus 3.33.4.redhat jna 5.8.0, h2 2.4.240, y18n 5.0.8, cliui 8.0.1, guice 5.1.0, wasm 2.15.3, +1016 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven at.yawk.lz4:lz4-java
<1.11.1
1.11.1
maven org.lz4:lz4-java
<=1.8.1
 no fix listed

Affected products

  • yawkat lz4-java

Classification

Weakness

References

Sources

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