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ALSA-2026:0752 — Important: jmc security update

Affected: AlmaLinux:9: jmc

JDK Mission Control is a powerful profiler for HotSpot JVMs and has an advanced set of tools that enables efficient and detailed analysis of the extensive data collected by JDK Flight Recorder. The tool chain enables developers and administrators to collect and analyze data from Java applications running locally or deployed in production environments.

Security Fix(es):

* lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing (CVE-2025-66566)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

bdu:2026-10878

certfr-2026-avi-0041 — De multiples vulnérabilités ont été découvertes dans les produits Elastic. Certaines d'entre elles permettent à un atta…

certfr-2026-avi-0041

Withdrawn: CLEANSTART-2026-AO61361 — Security fixes for CVE-2024-6763, CVE-2025-11143, CVE-2025-12183, CVE-2025-12383, CVE-2025-66566, CVE-2025-67030, CVE-2…

Withdrawn by the publisher.

Affected: CleanStart: kafka-fips

Multiple security vulnerabilities affect the kafka-fips package. These issues are resolved in later releases. See references for individual vulnerability details.

EUVD-2026-262668

fkie_cve-2025-66566

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.

GHSA-cmp6-m4wj-q63q — yawkat LZ4 Java has a possible information leak in Java safe decompressor

Affected: Maven: at.yawk.lz4:lz4-java, Maven: org.lz4:lz4-java, Maven: org.lz4:lz4-pure-java, Maven: net.jpountz.lz4:lz4

### Summary

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.

### Details

During the decompression process, the lz4 algorithm may have to repeat data that was previously decompressed in the same input frame. In the Java implementation, this is implemented by copy operations within the output buffer.

With a crafted input, an attacker may induce the Java implementation to copy from a region in the output buffer that does not contain decompressed data yet. If that region contains sensitive information because the output buffer was not cleared prior to decompression, that data will then be copied to the decompressed output.

- `LZ4Factory.nativeInstance().safeDecompressor()` *is not* affected. - `LZ4Factory.nativeInstance().fastDecompressor()` *is* affected because it actually uses `safeInstance()` since 1.8.1. In 1.8.0 and earlier versions, this implementation is instead vulnerable to the more severe [CVE‐2025‐12183](https://sites.google.com/sonatype.com/vulnerabilities/cve-2025-12183), so downgrading is not a solution. - Both decompressors of `LZ4Factory.safeInstance()`, `LZ4Factory.unsafeInstance()` and `LZ4Factory.fastestJavaInstance()` are affected. - `LZ…

NCSC-2026-0021 — Kwetsbaarheden verholpen in Oracle Database Server producten

NCSC-2026-0021

RHSA-2026:0131 — Red Hat Security Advisory: Red Hat build of Quarkus 3.20.4.SP1 security update

io.vertx/vertx-web: Eclipse Vert.x cross site scripting lz4-java: lz4-java: Out-of-bounds memory operations lead to denial of service and information disclosure lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing

RHSA-2026:0751 — Red Hat Security Advisory: jmc security update

lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing

RLSA-2026:20568 — Important: jmc security update

Affected: Rocky Linux:9: jmc

Security Fix(es):

* lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing (CVE-2025-66566)

* org.eclipse.jetty/jetty-http: HTTP request smuggling via chunked extension quoted-string parsing (CVE-2026-2332)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

UBUNTU-CVE-2025-66566

Affected: Ubuntu:20.04:LTS: lz4-java, Ubuntu:22.04:LTS: lz4-java, Ubuntu:24.04:LTS: lz4-java, Ubuntu:25.10: lz4-java, Ubuntu:26.04:LTS: lz4-java

WID-SEC-W-2026-0019 — Red Hat Enterprise Linux (Quarkus): Mehrere Schwachstellen

Ein entfernter, authentisierter oder anonymer Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen, einen Denial-of-Service-Zustand zu verursachen oder vertrauliche Informationen offenzulegen.