vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2025-66566

yawkat LZ4 Java has a possible information leak in Java safe decompressor

HIGH
8.2
CVSS Score
Published: December 5, 2025 at 06:10 PM UTC
Updated: September 25, 2026 at 11:27 PM UTC
1 product affected across 1 vendorLz4-java

Using lz4-java by yawkat?

Get instant alerts when new vulnerabilities affect lz4-java - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH8.2
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

yawkat LZ4 Java provides LZ4 compression for Java. Insufficient clearing of the output buffer in Java-based decompressor implementations in lz4-java 1.10.0 and earlier allows remote attackers to read previous buffer contents via crafted compressed input. In applications where the output buffer is reused without being cleared, this may lead to disclosure of sensitive data. JNI-based implementations are not affected. This vulnerability is fixed in 1.10.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Lz4-java· Yawkat
60%
v < 1.10.1
Affected range stops below 1.10.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_CONFIRM
Source: cverecord
https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q
x_refsource_MISC
Source: cverecord
https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.2HIGHGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-201

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card