{"cve":"CVE-2025-66566","nvd":{"published":"2025-12-05T18:15:59.580","modified":"2026-09-25T23:10:00.463","status":"Deferred","description":"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_v4":{"vector":"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","score":8.2},"cvss_v3":null,"cwes":["CWE-201"],"references":["https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840","https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2025-66566","score":0.00605,"percentile":0.48979,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-cmp6-m4wj-q63q","url":"https://osv.dev/vulnerability/GHSA-cmp6-m4wj-q63q","summary":"yawkat LZ4 Java has a possible information leak in Java safe decompressor","modified":"2026-09-10T03:50:58.809735567Z","packages":[{"ecosystem":"Maven","name":"at.yawk.lz4:lz4-java","purl":"pkg:maven/at.yawk.lz4/lz4-java","ranges":["<1.10.1"],"fixed":["1.10.1"]},{"ecosystem":"Maven","name":"org.lz4:lz4-java","purl":"pkg:maven/org.lz4/lz4-java","ranges":["<=1.8.1"],"fixed":[]},{"ecosystem":"Maven","name":"org.lz4:lz4-pure-java","purl":"pkg:maven/org.lz4/lz4-pure-java","ranges":["<=1.8.1"],"fixed":[]},{"ecosystem":"Maven","name":"net.jpountz.lz4:lz4","purl":"pkg:maven/net.jpountz.lz4/lz4","ranges":["<=1.8.1"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}