CVE-2025-66566

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-66566", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2025-12-04T16:17:35.385Z", "datePublished": "2025-12-05T18:10:16.470Z", "dateUpdated": "2025-12-05T18:27:32.797Z"}, "containers": {"cna": {"title": "yawkat LZ4 Java has a possible information leak in Java safe decompressor", "problemTypes": [{"descriptions": [{"cweId": "CWE-201", "lang": "en", "description": "CWE-201: Insertion of Sensitive Information Into Sent Data", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "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", "version": "4.0"}}], "references": [{"name": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q"}, {"name": "https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840", "tags": ["x_refsource_MISC"], "url": "https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840"}], "affected": [{"vendor": "yawkat", "product": "lz4-java", "versions": [{"version": "< 1.10.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2025-12-05T18:10:16.470Z"}, "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."}], "source": {"advisory": "GHSA-cmp6-m4wj-q63q", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-12-05T18:27:10.782475Z", "id": "CVE-2025-66566", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-12-05T18:27:32.797Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-66566", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2025-12-05T18:27:10.782475Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-12-05T18:27:22.958Z"}}], "cna": {"title": "yawkat LZ4 Java has a possible information leak in Java safe decompressor", "source": {"advisory": "GHSA-cmp6-m4wj-q63q", "discovery": "UNKNOWN"}, "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 8.2, "attackVector": "NETWORK", "baseSeverity": "HIGH", "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", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH"}}], "affected": [{"vendor": "yawkat", "product": "lz4-java", "versions": [{"status": "affected", "version": "< 1.10.1"}]}], "references": [{"url": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q", "name": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840", "name": "https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840", "tags": ["x_refsource_MISC"]}], "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-201", "description": "CWE-201: Insertion of Sensitive Information Into Sent Data"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2025-12-05T18:10:16.470Z"}}}, "cveMetadata": {"cveId": "CVE-2025-66566", "state": "PUBLISHED", "dateUpdated": "2025-12-05T18:27:32.797Z", "dateReserved": "2025-12-04T16:17:35.385Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2025-12-05T18:10:16.470Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "lz4-java", "vendor": "yawkat", "versions": [{"status": "affected", "version": "< 1.10.1"}]}], "source": "security-advisories@github.com"}], "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."}, {"lang": "es", "value": "yawkat LZ4 Java proporciona compresi\u00f3n LZ4 para Java. La limpieza insuficiente del b\u00fafer de salida en implementaciones de descompresores basadas en Java en lz4-java 1.10.0 y anteriores permite a atacantes remotos leer contenidos anteriores del b\u00fafer a trav\u00e9s de una entrada comprimida manipulada. En aplicaciones donde el b\u00fafer de salida se reutiliza sin ser limpiado, esto puede llevar a la divulgaci\u00f3n de datos sensibles. Las implementaciones basadas en JNI no se ven afectadas. Esta vulnerabilidad est\u00e1 corregida en 1.10.1."}], "id": "CVE-2025-66566", "lastModified": "2026-09-25T23:10:00.463", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-66566", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-12-05T18:27:10.782475Z", "version": "2.0.3"}}]}, "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": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-201"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing", "id": "2419500", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419500"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-908", "details": ["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."], "name": "CVE-2025-66566", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "jmc:rhel8/lz4-java", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Under investigation", "package_name": "lz4-java", "product_name": "streams for Apache Kafka 3"}], "public_date": "2025-12-05T18:10:16Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-66566\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-66566\nhttps://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840\nhttps://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q"], "statement": "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.", "threat_severity": "Important"}

{}