CLEANSTART-2026-CX61220 yawkat LZ4 Java provides LZ4 compression for Java

Security vulnerability affects the apache-nifi package. yawkat LZ4 Java provides LZ4 compression for Java...

CLEANSTART-2026-UB44506 yawkat LZ4 Java provides LZ4 compression for Java

Security vulnerability affects the apache-hive package. yawkat LZ4 Java provides LZ4 compression for Java...

yawkat LZ4 Java: Native library extraction to a shared temporary directory is vulnerable to file replacement by another local user

Summary When no system-installed liblz4-java is found, net.jpountz.util.Native.load extracts the bundled native library to java.io.tmpdir and loads it with System.load. The path of the extracted library can be predicted before it is created, and the library file is opened without exclusive...

EUVD-2026-93868

yawkat LZ4 Java: Native library extraction to a shared temporary directory is vulnerable to file replacement by another local user...

GHSA-MCR4-QMVW-PX4G yawkat LZ4 Java: Native library extraction to a shared temporary directory is vulnerable to file replacement by another local user

Summary When no system-installed liblz4-java is found, net.jpountz.util.Native.load extracts the bundled native library to java.io.tmpdir and loads it with System.load. The path of the extracted library can be predicted before it is created, and the library file is opened without exclusive...

EUVD-2026-93862

yawkat LZ4 Java: LZ4BlockInputStream with stopOnEmptyBlock=false recurses once per empty block, causing StackOverflowError...

GHSA-343H-94H5-C4WR yawkat LZ4 Java: LZ4BlockInputStream with stopOnEmptyBlock=false recurses once per empty block, causing StackOverflowError

Summary When LZ4BlockInputStream is configured with stopOnEmptyBlock = false the mode for reading concatenated block streams, it handles each empty block by calling refill recursively. A long run of empty blocks exhausts the thread stack and throws StackOverflowError out of read or skip. Details ...

GHSA-GM45-99XC-R7WV yawkat LZ4 Java: LZ4FrameInputStream reallocates block buffers for every frame, allowing CPU and GC amplification from small inputs

Summary LZ4FrameInputStream allocates two new buffers of the frame's maximum block size, up to 4 MiB each, every time it reads a frame header. Because concatenated frames are read by default, an input made of many minimal empty frames forces about 8 MiB of zeroed heap allocation for every 11 inpu...

EUVD-2026-93865

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

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

Summary LZ4FrameInputStream allocates two new buffers of the frame's maximum block size, up to 4 MiB each, every time it reads a frame header. Because concatenated frames are read by default, an input made of many minimal empty frames forces about 8 MiB of zeroed heap allocation for every 11 inpu...

GHSA-4V53-57PG-C464 yawkat LZ4 Java: LZ4BlockInputStream allocates an unvalidated compressed length from the stream header

Summary LZ4BlockInputStream grows its compressed-input buffer to the attacker-controlled compressedLen value from the legacy LZ4Block stream header before reading any payload bytes. A header-only input can therefore trigger a near-2 GiB allocation and exhaust the JVM heap. Details In...

EUVD-2026-93871

yawkat LZ4 Java: LZ4BlockInputStream allocates an unvalidated compressed length from the stream header...

yawkat LZ4 Java: LZ4BlockInputStream allocates an unvalidated compressed length from the stream header

Summary LZ4BlockInputStream grows its compressed-input buffer to the attacker-controlled compressedLen value from the legacy LZ4Block stream header before reading any payload bytes. A header-only input can therefore trigger a near-2 GiB allocation and exhaust the JVM heap. Details In...

yawkat LZ4 Java: LZ4DecompressorWithLength allocates the unvalidated size from the 4-byte length header, so a 5-byte input triggers a 1 GiB allocation and OutOfMemoryError

Summary LZ4DecompressorWithLength.decompressbyte, int allocates whatever size the 4-byte length header declares, before it reads a single byte of compressed data. A 5-byte input whose header says 0x40000000 makes the JVM commit a gigabyte and can cause heap exhaustion. Details...

EUVD-2026-93872

yawkat LZ4 Java: LZ4DecompressorWithLength allocates the unvalidated size from the 4-byte length header, so a 5-byte input triggers a 1 GiB allocation and OutOfMemoryError...

GHSA-6CX8-RJF8-PR8G yawkat LZ4 Java: LZ4DecompressorWithLength allocates the unvalidated size from the 4-byte length header, so a 5-byte input triggers a 1 GiB allocation and OutOfMemoryError

Summary LZ4DecompressorWithLength.decompressbyte, int allocates whatever size the 4-byte length header declares, before it reads a single byte of compressed data. A 5-byte input whose header says 0x40000000 makes the JVM commit a gigabyte and can cause heap exhaustion. Details...

CVE-2026-106449

A flaw was found in lz4-java. This issue can lead to a Denial of Service DoS when the LZ4 input stream is configured not to stop upon encountering empty blocks. In this non-default configuration, consecutive empty blocks are processed via recursive calls rather than iterative handling. A remote...

CVE-2026-106453

A flaw was found in lz4-java. The library trusts the decompressed length header in compressed input before validating the input data, leading to uncontrolled memory allocation. A remote attacker can exploit this vulnerability by supplying a specially crafted input that specifies an excessively...

CVE-2026-106452

A flaw was found in lz4-java. A remote attacker can trigger a Denial of Service DoS by providing a crafted compressed data stream with an oversized block header. During decompression, the input stream allocates memory based on this attacker-controlled size field before reading the actual payload,...

CVE-2026-106451

A flaw was found in lz4-java. When extracting native libraries, the application writes temporary files to a shared directory using predictable file paths without exclusive file creation controls. A local attacker with access to the shared directory could exploit this race condition to replace the...