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CVE-2025-66566 (GCVE-0-2025-66566)
Vulnerability from cvelistv5 – Published: 2025-12-05 18:10 – Updated: 2025-12-05 18:27
VLAI?
EPSS
Title
yawkat LZ4 Java has a possible information leak in Java safe decompressor
Summary
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.
Severity ?
CWE
- CWE-201 - Insertion of Sensitive Information Into Sent Data
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
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RHSA-2026:0131
Vulnerability from csaf_redhat - Published: 2026-01-06 13:12 - Updated: 2026-01-15 19:53Summary
Red Hat Security Advisory: Red Hat build of Quarkus 3.20.4.SP1 security update
Notes
Topic
An update is now available for Red Hat build of Quarkus.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability. For more information, see the CVE links in the References section.
Details
This release of Red Hat build of Quarkus 3.20.4.SP1 includes the following CVE fixes:
* lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing [quarkus-3.20] (CVE-2025-66566)
* lz4-java: lz4-java: Out-of-bounds memory operations lead to denial of service and information disclosure [quarkus-3.20] (CVE-2025-12183)
* vertx-web: Eclipse Vert.x cross site scripting [quarkus-3.20 (CVE-2025-11966)
For more information, see the release notes page listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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RHSA-2026:0467
Vulnerability from csaf_redhat - Published: 2026-01-12 15:04 - Updated: 2026-01-15 21:58Summary
Red Hat Security Advisory: Red Hat Build of Apache Camel 4.10 for Quarkus 3.20 update is now available (RHBQ 3.20.4.SP1)
Notes
Topic
An update for Red Hat Build of Apache Camel 4.10 for Quarkus 3.20 update is now available (RHBQ 3.20.4.SP1).
The purpose of this text-only errata is to inform you about the enhancements that improve your developer experience and ensure the security and stability of your products.
Red Hat Product Security has rated this update as having a security impact of Important.
Details
An update for Red Hat Build of Apache Camel 4.10 for Quarkus 3.20 update is now available (RHBQ 3.20.4.SP1).
The purpose of this text-only errata is to inform you about the enhancements that improve your developer experience and ensure the security and stability of your products:
* lz4-java: lz4-java: Information Disclosure via Insufficient Output
Buffer Clearing (CVE-2025-66566)
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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RHSA-2026:0726
Vulnerability from csaf_redhat - Published: 2026-01-15 19:53 - Updated: 2026-01-15 21:58Summary
Red Hat Security Advisory: Red Hat Build of Apache Camel 4.14.2.P1 for Spring Boot release.
Notes
Topic
Red Hat build of Apache Camel 4.14.2 for Spring Boot patch 1 release and security update is now available.
Red Hat Product Security has rated this update as having a security impact of
Important. A Common Vulnerability Scoring System (CVSS) base score, which gives
a detailed severity rating, is available for each vulnerability from the CVE
link(s) in the References section.
Details
Red Hat build of Apache Camel 4.14.2 for Spring Boot patch 1 release and security update is now available.
The purpose of this text-only errata is to inform you about the security issues fixed.
Security Fix(es):
* lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing (CVE-2025-66566)
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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RHSA-2026:0468
Vulnerability from csaf_redhat - Published: 2026-01-12 15:22 - Updated: 2026-01-15 21:58Summary
Red Hat Security Advisory: Red Hat Build of Apache Camel 4.14 for Quarkus 3.27 update is now available (RHBQ 3.27.1.SP1)
Notes
Topic
An update for Red Hat Build of Apache Camel 4.14 for Quarkus 3.27 update is now available (RHBQ 3.27.1.SP1).
The purpose of this text-only errata is to inform you about the enhancements that improve your developer experience and ensure the security and stability of your products.
Red Hat Product Security has rated this update as having a security impact of Important.
Details
An update for Red Hat Build of Apache Camel 4.14 for Quarkus 3.27 update is now available (RHBQ 3.27.1.SP1).
The purpose of this text-only errata is to inform you about the enhancements that improve your developer experience and ensure the security and stability of your products:
* lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing (CVE-2025-66566)
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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RHSA-2026:0134
Vulnerability from csaf_redhat - Published: 2026-01-06 13:22 - Updated: 2026-01-15 19:53Summary
Red Hat Security Advisory: Red Hat build of Quarkus 3.27.1.SP1 security update
Notes
Topic
An update is now available for Red Hat build of Quarkus.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability. For more information, see the CVE links in the References section.
Details
This release of Red Hat build of Quarkus 3.27.1.SP1 includes the following CVE fixes:
* lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing [quarkus-3.27] (CVE-2025-66566)
* lz4-java: lz4-java: Out-of-bounds memory operations lead to denial of service and information disclosure [quarkus-3.27] (CVE-2025-12183)
* vertx-web: Eclipse Vert.x cross site scripting [quarkus-3.27] (CVE-2025-11966)
For more information, see the release notes page listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat build of Quarkus 3.27.1.SP1"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-12183"
},
{
"category": "external",
"summary": "RHBZ#2417718",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2417718"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-12183",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-12183"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-12183",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-12183"
},
{
"category": "external",
"summary": "https://github.com/yawkat/lz4-java/releases/tag/v1.8.1",
"url": "https://github.com/yawkat/lz4-java/releases/tag/v1.8.1"
},
{
"category": "external",
"summary": "https://sites.google.com/sonatype.com/vulnerabilities/cve-2025-12183",
"url": "https://sites.google.com/sonatype.com/vulnerabilities/cve-2025-12183"
}
],
"release_date": "2025-11-28T15:52:56.140000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-01-06T13:22:25+00:00",
"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
"Red Hat build of Quarkus 3.27.1.SP1"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:0134"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat build of Quarkus 3.27.1.SP1"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "lz4-java: lz4-java: Out-of-bounds memory operations lead to denial of service and information disclosure"
},
{
"cve": "CVE-2025-66566",
"cwe": {
"id": "CWE-908",
"name": "Use of Uninitialized Resource"
},
"discovery_date": "2025-12-05T19:00:50.134024+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2419500"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in lz4-java. This vulnerability allows disclosure of sensitive data via crafted compressed input due to insufficient clearing of the output buffer in Java-based decompressor implementations.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated IMPORTANT because it allows for information disclosure when Java-based decompressor implementations reuse output buffers without proper clearing, potentially exposing sensitive data via crafted compressed input. JNI-based implementations of lz4-java are not affected by this issue.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat build of Quarkus 3.27.1.SP1"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-66566"
},
{
"category": "external",
"summary": "RHBZ#2419500",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419500"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-66566",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-66566"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-66566",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66566"
},
{
"category": "external",
"summary": "https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840",
"url": "https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840"
},
{
"category": "external",
"summary": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q",
"url": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q"
}
],
"release_date": "2025-12-05T18:10:16.470000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-01-06T13:22:25+00:00",
"details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
"Red Hat build of Quarkus 3.27.1.SP1"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:0134"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"products": [
"Red Hat build of Quarkus 3.27.1.SP1"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing"
}
]
}
CERTFR-2026-AVI-0041
Vulnerability from certfr_avis - Published: 2026-01-14 - Updated: 2026-01-14
De multiples vulnérabilités ont été découvertes dans les produits Elastic. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et une falsification de requêtes côté serveur (SSRF).
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Elastic | Packetbeat | Packetbeat versions 9.2.x antérieures à 9.2.4 | ||
| Elastic | Packetbeat | Packetbeat toutes versions 7.x | ||
| Elastic | Packetbeat | Packetbeat versions 8.19.x antérieures à 8.19.10 | ||
| Elastic | Packetbeat | Packetbeat versions 9.x antérieures à 9.1.10 | ||
| Elastic | Metricbeat | Metricbeat toutes versions 7.x | ||
| Elastic | Metricbeat | Metricbeat versions 8.19.x antérieures à 8.19.10 | ||
| Elastic | Elasticsearch | Elasticsearch versions 9.2.x antérieures à 9.2.4 | ||
| Elastic | Metricbeat | Metricbeat versions 9.x antérieures à 9.1.10 | ||
| Elastic | Elasticsearch | Elasticsearch toutes versions 7.x | ||
| Elastic | Elasticsearch | Elasticsearch versions 9.x antérieures à 9.1.10 | ||
| Elastic | Elasticsearch | Elasticsearch versions 8.19.x antérieures à 8.19.10 | ||
| Elastic | Metricbeat | Metricbeat versions 9.2.x antérieures à 9.2.4 | ||
| Elastic | Kibana | Kibana versions 8.19.x antérieures à 8.19.10 | ||
| Elastic | Kibana | Kibana toutes versions 7.x | ||
| Elastic | Kibana | Kibana versions 9.2.x antérieures à 9.2.4 | ||
| Elastic | Kibana | Kibana versions 9.x antérieures à 9.1.10 |
References
| Title | Publication Time | Tags | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Packetbeat versions 9.2.x ant\u00e9rieures \u00e0 9.2.4",
"product": {
"name": "Packetbeat",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Packetbeat toutes versions 7.x",
"product": {
"name": "Packetbeat",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Packetbeat versions 8.19.x ant\u00e9rieures \u00e0 8.19.10",
"product": {
"name": "Packetbeat",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Packetbeat versions 9.x ant\u00e9rieures \u00e0 9.1.10",
"product": {
"name": "Packetbeat",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Metricbeat toutes versions 7.x",
"product": {
"name": "Metricbeat",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Metricbeat versions 8.19.x ant\u00e9rieures \u00e0 8.19.10",
"product": {
"name": "Metricbeat",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Elasticsearch versions 9.2.x ant\u00e9rieures \u00e0 9.2.4",
"product": {
"name": "Elasticsearch",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Metricbeat versions 9.x ant\u00e9rieures \u00e0 9.1.10",
"product": {
"name": "Metricbeat",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Elasticsearch toutes versions 7.x",
"product": {
"name": "Elasticsearch",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Elasticsearch versions 9.x ant\u00e9rieures \u00e0 9.1.10",
"product": {
"name": "Elasticsearch",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Elasticsearch versions 8.19.x ant\u00e9rieures \u00e0 8.19.10",
"product": {
"name": "Elasticsearch",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Metricbeat versions 9.2.x ant\u00e9rieures \u00e0 9.2.4",
"product": {
"name": "Metricbeat",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Kibana versions 8.19.x ant\u00e9rieures \u00e0 8.19.10",
"product": {
"name": "Kibana",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Kibana toutes versions 7.x",
"product": {
"name": "Kibana",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Kibana versions 9.2.x ant\u00e9rieures \u00e0 9.2.4",
"product": {
"name": "Kibana",
"vendor": {
"name": "Elastic",
"scada": false
}
}
},
{
"description": "Kibana versions 9.x ant\u00e9rieures \u00e0 9.1.10",
"product": {
"name": "Kibana",
"vendor": {
"name": "Elastic",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-0532",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-0532"
},
{
"name": "CVE-2026-0528",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-0528"
},
{
"name": "CVE-2026-0530",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-0530"
},
{
"name": "CVE-2026-0529",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-0529"
},
{
"name": "CVE-2025-66566",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-66566"
},
{
"name": "CVE-2026-0543",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-0543"
},
{
"name": "CVE-2026-0531",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-0531"
}
],
"initial_release_date": "2026-01-14T00:00:00",
"last_revision_date": "2026-01-14T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0041",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-01-14T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
},
{
"description": "Falsification de requ\u00eates c\u00f4t\u00e9 serveur (SSRF)"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans les produits Elastic. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer un d\u00e9ni de service \u00e0 distance, une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es et une falsification de requ\u00eates c\u00f4t\u00e9 serveur (SSRF).",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans les produits Elastic",
"vendor_advisories": [
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Elastic ESA-2026-08",
"url": "https://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-08/384523"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Elastic ESA-2026-02",
"url": "https://discuss.elastic.co/t/packetbeat-8-19-10-9-1-10-9-2-4-security-update-esa-2026-02/384520"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Elastic ESA-2026-01",
"url": "https://discuss.elastic.co/t/metricbeat-8-19-10-9-1-10-9-2-4-security-update-esa-2026-01/384519"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Elastic ESA-2026-04",
"url": "https://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-04/384522"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Elastic ESA-2026-05",
"url": "https://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-05/384524"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Elastic ESA-2026-07",
"url": "https://discuss.elastic.co/t/elasticsearch-8-19-10-9-1-10-9-2-4-security-update-esa-2026-07/384525"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Elastic ESA-2026-03",
"url": "https://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-03/384521"
}
]
}
FKIE_CVE-2025-66566
Vulnerability from fkie_nvd - Published: 2025-12-05 18:15 - Updated: 2025-12-08 18:26
Severity ?
Summary
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"id": "CVE-2025-66566",
"lastModified": "2025-12-08T18:26:49.133",
"metrics": {
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
},
"published": "2025-12-05T18:15:59.580",
"references": [
{
"source": "security-advisories@github.com",
"url": "https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840"
},
{
"source": "security-advisories@github.com",
"url": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q"
}
],
"sourceIdentifier": "security-advisories@github.com",
"vulnStatus": "Awaiting Analysis",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-201"
}
],
"source": "security-advisories@github.com",
"type": "Secondary"
}
]
}
GHSA-CMP6-M4WJ-Q63Q
Vulnerability from github – Published: 2025-12-05 18:54 – Updated: 2025-12-05 18:54
VLAI?
Summary
yawkat LZ4 Java has a possible information leak in Java safe decompressor
Details
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 usessafeInstance()since 1.8.1. In 1.8.0 and earlier versions, this implementation is instead vulnerable to the more severe CVE‐2025‐12183, so downgrading is not a solution.- Both decompressors of
LZ4Factory.safeInstance(),LZ4Factory.unsafeInstance()andLZ4Factory.fastestJavaInstance()are affected. LZ4Factory.fastestInstance()uses thenativeInstanceorfastestJavaInstancedepending on platform.LZ4Factory.fastestInstance().fastDecompressor()is always affected, whileLZ4Factory.fastestInstance().safeDecompressor()is affected only when JNI cannot be used (e.g. on unsupported platforms).
Independent of this vulnerability, it is recommended that users migrate from fastDecompressor to safeDecompressor, as the latter is more performant (despite the name).
The impact of this vulnerability depends on how user code interacts with the decompression API. Users that allocate a new destination buffer each time, or use only zeroed buffers, are not impacted. When the buffer is reused, however, the confidentiality impact can be severe. This vulnerability is marked as VC:H out of caution.
Mitigation
lz4-java 1.10.1 fixes this issue without requiring changes in user code.
If you cannot upgrade to 1.10.1, you can mitigate this vulnerability by zeroing the output buffer before passing it to the decompression function.
Relation to CVE‐2025‐12183
This CVE is a different attack than CVE‐2025‐12183, affecting different implementations with different impact. This new vulnerability was discovered by CodeIntelligence during research that followed up on CVE‐2025‐12183. Users are recommended to upgrade to 1.10.1 to fix both vulnerabilities.
Severity ?
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 1.10.0"
},
"package": {
"ecosystem": "Maven",
"name": "at.yawk.lz4:lz4-java"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.10.1"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Maven",
"name": "org.lz4:lz4-java"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "1.8.1"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Maven",
"name": "org.lz4:lz4-pure-java"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "1.8.1"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Maven",
"name": "net.jpountz.lz4:lz4"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "1.8.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-66566"
],
"database_specific": {
"cwe_ids": [
"CWE-201"
],
"github_reviewed": true,
"github_reviewed_at": "2025-12-05T18:54:55Z",
"nvd_published_at": "2025-12-05T18:15:59Z",
"severity": "HIGH"
},
"details": "### Summary\n\nInsufficient 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.\n\nJNI-based implementations are *not* affected.\n\n### Details\n\nDuring 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.\n\nWith 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.\n\n- `LZ4Factory.nativeInstance().safeDecompressor()` *is not* affected.\n- `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\u20102025\u201012183](https://sites.google.com/sonatype.com/vulnerabilities/cve-2025-12183), so downgrading is not a solution.\n- Both decompressors of `LZ4Factory.safeInstance()`, `LZ4Factory.unsafeInstance()` and `LZ4Factory.fastestJavaInstance()` are affected.\n- `LZ4Factory.fastestInstance()` uses the `nativeInstance` or `fastestJavaInstance` depending on platform. `LZ4Factory.fastestInstance().fastDecompressor()` is always affected, while `LZ4Factory.fastestInstance().safeDecompressor()` is affected only when JNI cannot be used (e.g. on unsupported platforms).\n\nIndependent of this vulnerability, it is recommended that users migrate from `fastDecompressor` to `safeDecompressor`, as the latter is more performant (despite the name).\n\nThe impact of this vulnerability depends on how user code interacts with the decompression API. Users that allocate a new destination buffer each time, or use only zeroed buffers, are not impacted. When the buffer is reused, however, the confidentiality impact can be severe. This vulnerability is marked as VC:H out of caution.\n\n### Mitigation\n\nlz4-java 1.10.1 fixes this issue without requiring changes in user code.\n\nIf you cannot upgrade to 1.10.1, you can mitigate this vulnerability by zeroing the output buffer before passing it to the decompression function.\n\n### Relation to CVE\u20102025\u201012183\n\nThis CVE is a different attack than [CVE\u20102025\u201012183](https://sites.google.com/sonatype.com/vulnerabilities/cve-2025-12183), affecting different implementations with different impact. This new vulnerability was discovered by [CodeIntelligence](https://www.code-intelligence.com/) during research that followed up on CVE\u20102025\u201012183. Users are recommended to upgrade to 1.10.1 to fix both vulnerabilities.",
"id": "GHSA-cmp6-m4wj-q63q",
"modified": "2025-12-05T18:54:55Z",
"published": "2025-12-05T18:54:55Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66566"
},
{
"type": "WEB",
"url": "https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840"
},
{
"type": "PACKAGE",
"url": "https://github.com/yawkat/lz4-java"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "yawkat LZ4 Java has a possible information leak in Java safe decompressor"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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