What is CVE-2026-106452?

CVE-2026-106452 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-2026-106452?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Yawkat Lz4-Java

CVE-2026-106452

yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, net.jpountz.lz4.LZ4BlockInputStream refill() validates that the compressedLen field in a legacy LZ4Block header is nonnegative but allocates a compressed-input buffer of that attacker-controlled size before reading payload data, allowing a header-only stream to request a near-2 GiB allocation and exhaust the JVM heap. Canonical writers emit raw blocks when compression is not smaller than the original block, but vulnerable readers accept non-canonical oversized compressed blocks. This issue is fixed in version 1.11.2.

Published 2026-10-06 · last modified 2026-10-07.

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)

CWE-789

References

Frequently asked questions

What is CVE-2026-106452?: CVE-2026-106452 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-2026-106452?: Medium severity. CVSS v3 base score is 5.3 out of 10.