Vulnerability in Yawkat Lz4-Java
CVE-2026-106453
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Yawkat Lz4-Java — versions < 1.11.2
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-106453?
- CVE-2026-106453 is a medium-severity vulnerability in Yawkat Lz4-Java, classified under CWE-789. CVSS score: 5.3/10. Published 2026-10-06.
- How severe is CVE-2026-106453?
- Medium severity. CVSS v3 base score is 5.3 out of 10.