yawkat LZ4 Java: LZ4FrameInputStream reallocates block buffers for every frame, allowing CPU and GC amplification from small inputs

[ Description ]Official 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.

[ Fixes ]Fixes and patches

• at.yawk.lz4:lz4-java 1.11.4Fixed version · GitHub Advisories · maven package at.yawk.lz4:lz4-java: upgrade to 1.11.4 or later (affected <= 1.11.3)

[ Advisories ]Government CERT advisories

• BSI CERT-Bund18 Oct 2026WID-SEC-2026-4013

  DBeaver: Multiple vulnerabilities Translated from German

  CVE-2026-106449CVE-2026-106450CVE-2026-106451

[ Packages ]Affected open-source packages

• at.yawk.lz4:lz4-java mavenAffected <= 1.11.3 · fixed in 1.11.4 · GHSA-gm45-99xc-r7wv
• org.lz4:lz4-java mavenAffected <= 1.8.1 · GHSA-gm45-99xc-r7wv

[ References ]References

• github.com/yawkat/lz4-java/commit/2acc0ec1ead226145c62a817c18c8ed49233a283
• github.com/yawkat/lz4-java/releases/tag/v1.11.4
• github.com/yawkat/lz4-java/security/advisories/GHSA-gm45-99xc-r7wv