---
id: CVE-2026-106453
title: yawkat LZ4 Java provides LZ4 compression for Java
summary: >-
  yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2,
  LZ4DecompressorWithLength uses getDecompressedLength to trust the four-byte
  decompressed-length header before validating the compressed input, allowing a
  five-byte attac…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-789
vendor: yawkat
product: lz4-java
affected:
  - lz4-java < 1.11.2
published: '2026-10-06'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T20:17:27.457'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106453'
references:
  - url: >-
      https://github.com/yawkat/lz4-java/commit/6492ce5aca6bd03ff9e08ee18a2beb94c431371a
    label: security-advisories@github.com
  - url: 'https://github.com/yawkat/lz4-java/releases/tag/v1.11.2'
    label: security-advisories@github.com
  - url: 'https://github.com/yawkat/lz4-java/security/advisories/GHSA-6cx8-rjf8-pr8g'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T20:16:42.472Z'
---

## Overview

yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, LZ4DecompressorWithLength uses getDecompressedLength to trust the four-byte decompressed-length header before validating the compressed input, allowing a five-byte attacker-supplied input whose header declares a large output size to request up to approximately 2 GiB and exhaust the JVM heap. Convenience overloads backed by LZ4FastDecompressor or LZ4SafeDecompressor allocate the untrusted size, while overloads that write to a caller-provided destination buffer are not affected because the caller controls the destination size. This issue is fixed in version 1.11.2.

## Remediation

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