CVE WatchOct 7, 2026

CVE-2026-106453

yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, LZ4DecompressorWithLength uses getDecompressedLength to trust the four-b

CVSS

5.3

Medium

EPSS

0.4%

p30

KEV

—

Exploit Today

0-100

Published: Oct 6, 2026 · Last modified: Oct 7, 2026 · CWE-789

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-10-072026-10-22

Technical description

yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, LZ4DecompressorWithLength uses getDecompressedLength to trust the four-byte decompressed-length header before validating the compressed input, allowing a five-byte attacker-supplied input whose header declares a large output size to request up to approximately 2 GiB and exhaust the JVM heap. Convenience overloads backed by LZ4FastDecompressor or LZ4SafeDecompressor allocate the untrusted size, while overloads that write to a caller-provided destination buffer are not affected because the caller controls the destination size. This issue is fixed in version 1.11.2.

Official references

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