---
id: CVE-2026-59949
title: yawkat LZ4 Java provides LZ4 compression for Java
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.n…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H'
cwe:
  - CWE-476
  - CWE-125
vendor: yawk
product: 'at.yawk.lz4:lz4-java'
affected:
  - 'at.yawk.lz4:lz4-java <= 1.11.0'
  - 'org.lz4:lz4-java <= 1.8.1'
patched:
  - 'at.yawk.lz4:lz4-java 1.11.1'
published: '2026-08-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59949'
references:
  - url: >-
      https://github.com/yawkat/lz4-java/commit/dbd86d04b8dd716e1c2bc626be54189997d910da
    label: security-advisories@github.com
  - url: 'https://github.com/yawkat/lz4-java/releases/tag/v1.11.1'
    label: security-advisories@github.com
  - url: 'https://github.com/yawkat/lz4-java/security/advisories/GHSA-xx22-p4ch-683r'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-xx22-p4ch-683r'
tags:
  - nvd
  - ghsa
  - maven
epss: 0.00453
epssPercentile: 0.38693
aliases:
  - GHSA-xx22-p4ch-683r
ecosystem: maven
ingestedAt: '2026-07-24T16:33:09.611Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-59949)

Affected packages:

- `at.yawk.lz4:lz4-java <= 1.11.0`
- `org.lz4:lz4-java <= 1.8.1`

Patched in:

- `at.yawk.lz4:lz4-java 1.11.1`

Source: https://github.com/advisories/GHSA-xx22-p4ch-683r