CVE-2026-106450

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductAt.yawk.lz4:lz4-java

PublishedOct 6, 2026

First seenOct 6, 2026

Weakness typeCWE-770Allocation of resources without limits

How to fix

Update

at.yawk.lz4:lz4-java1.11.4 or later

Affected products

Product	Affected versions	Fixed in
at.yawk.lz4:lz4-javaMaven	v < 1.11.4	1.11.4
org.lz4:lz4-javaMaven	v ≤ 1.8.1	—

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