Information Exposure Affecting jmc package, versions <0:8.2.0-19.el9_8.2


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.61% (47th percentile)

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  • Snyk IDSNYK-ORACLE9-JMC-15036298
  • published19 Jan 2026
  • disclosed5 Dec 2025

Introduced: 5 Dec 2025

CVE-2025-66566  (opens in a new tab)
CWE-201  (opens in a new tab)

How to fix?

Upgrade Oracle:9 jmc to version 0:8.2.0-19.el9_8.2 or higher.
This issue was patched in ELSA-2026-20568.

NVD Description

Note: Versions mentioned in the description apply only to the upstream jmc package and not the jmc package as distributed by Oracle. See How to fix? for Oracle:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1