yawkat lz4-java up to 1.10.0 insertion of sensitive information into sent data

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in yawkat lz4-java up to 1.10.0. It has been rated as problematic. Impacted is an unknown function. This manipulation causes insertion of sensitive information into sent data. This vulnerability is tracked as CVE-2025-66566. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in yawkat lz4-java up to 1.10.0. It has been declared as problematic. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a insertion of sensitive information into sent data vulnerability. The CWE definition for the vulnerability is CWE-201. The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2025-66566 since 12/04/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 277643 (Linux Distros Unpatched Vulnerability : CVE-2025-66566), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.10.1 eliminates this vulnerability. Applying the patch 33d180cb70c4d93c80fb0dc3ab3002f457e93840 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (277643) and CERT Bund (WID-SEC-2026-0019). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Red Hat Enterprise Linux
  • Oracle Linux
  • IBM InfoSphere Information Server

Productinfo

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Vendor

Name

Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Insertion of sensitive information into sent data
CWE: CWE-201 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 277643
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-66566

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: lz4-java 1.10.1
Patch: 33d180cb70c4d93c80fb0dc3ab3002f457e93840

Timelineinfo

12/04/2025 CVE reserved
12/06/2025 +2 days Advisory disclosed
12/06/2025 +0 days VulDB entry created
02/03/2026 +59 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-cmp6-m4wj-q63q
Status: Confirmed

CVE: CVE-2025-66566 (🔒)
GCVE (CVE): GCVE-0-2025-66566
GCVE (VulDB): GCVE-100-334537
CERT Bund: WID-SEC-2026-0019 - Red Hat Enterprise Linux (Quarkus): Mehrere Schwachstellen

Entryinfo

Created: 12/06/2025 04:56
Updated: 02/03/2026 10:47
Changes: 12/06/2025 04:56 (70), 12/09/2025 03:41 (2), 02/03/2026 10:47 (7)
Complete: 🔍
Cache ID: 216:34A:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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