---
id: CVE-2026-106452
title: yawkat LZ4 Java provides LZ4 compression for Java
summary: >-
  yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2,
  net.jpountz.lz4.LZ4BlockInputStream refill() validates that the compressedLen
  field in a legacy LZ4Block header is nonnegative but allocates a
  compressed-input buffer of…
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: '2026-10-06T20:17:27.317'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-106452'
references:
  - url: >-
      https://github.com/yawkat/lz4-java/commit/bb83dd16163cdb71231af06b0a5651881148a634
    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-4v53-57pg-c464'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-06T20:16:42.474Z'
---

## Overview

yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, net.jpountz.lz4.LZ4BlockInputStream refill() validates that the compressedLen field in a legacy LZ4Block header is nonnegative but allocates a compressed-input buffer of that attacker-controlled size before reading payload data, allowing a header-only stream to request a near-2 GiB allocation and exhaust the JVM heap. Canonical writers emit raw blocks when compression is not smaller than the original block, but vulnerable readers accept non-canonical oversized compressed blocks. This issue is fixed in version 1.11.2.

## Remediation

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