yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.4, net.jpountz.lz4.LZ4FrameInputStream readHeader() allocates two new 4 MiB block buffers whenever a maximum-block-size frame header is read, and the default concatenated-frame mode allows attacker-controlled streams containing many minimal empty frames to trigger roughly 8 MiB of allocation for every 11 input bytes. The stream produces no decompressed output while consuming CPU and garbage-collection time, so decompressed-size limits do not mitigate the issue; readSingleFrame mode is not affected. This issue is fixed in version 1.11.4.
History

Fri, 09 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 07 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Wed, 07 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
First Time appeared Yawkat
Yawkat lz4-java
Vendors & Products Yawkat
Yawkat lz4-java

Tue, 06 Oct 2026 20:00:00 +0000

Type Values Removed Values Added
Description yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.4, net.jpountz.lz4.LZ4FrameInputStream readHeader() allocates two new 4 MiB block buffers whenever a maximum-block-size frame header is read, and the default concatenated-frame mode allows attacker-controlled streams containing many minimal empty frames to trigger roughly 8 MiB of allocation for every 11 input bytes. The stream produces no decompressed output while consuming CPU and garbage-collection time, so decompressed-size limits do not mitigate the issue; readSingleFrame mode is not affected. This issue is fixed in version 1.11.4.
Title yawkat LZ4 Java: LZ4FrameInputStream reallocates block buffers for every frame, allowing CPU and GC amplification from small inputs
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-06T19:48:40.092Z

Updated: 2026-10-09T01:44:37.343Z

Reserved: 2026-10-06T16:49:40.591Z

Link: CVE-2026-106450

cve-icon Vulnrichment

Updated: 2026-10-09T01:44:33.103Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-06T20:17:27.037

Modified: 2026-10-09T02:16:59.843

Link: CVE-2026-106450

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-06T19:48:40Z

Links: CVE-2026-106450 - Bugzilla