CVE-2026-106450: Yawkat LZ4-Java

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Yawkat LZ4-Java: before 1.11.4 (fixed in 1.11.4)

Published 2026-10-06. Last modified 2026-10-09.